How to Launch a Research Peptide eCommerce Store: Everything You Need Before You Build

Launching a research peptide eCommerce store is not the same as launching a supplement brand, skincare shop, or standard online store. The product category is sensitive, payment processors treat it as high risk, advertising platforms are restrictive, and your website copy can create regulatory problems if it implies human use, treatment, dosing, recovery, weight loss, or medical outcomes.

That is why the smartest founders do not start with a logo, theme, or product upload. They start with the operating system behind the store: compliance architecture, payment processing, batch-specific COA management, product-page structure, fulfillment SOPs, and a search strategy that can grow without relying on risky health claims.

This guide explains what you need before building a research peptide eCommerce website, how to choose the right peptide eCommerce platform, what competitors often miss, and how a compliance-first build can protect your store from expensive rebuilds, payment disruptions, and weak SEO performance.

This article is for research-use-only peptide eCommerce founders, lab-supply brands, research chemical merchants, and teams planning a WooCommerce peptide store. It is not medical, legal, pharmacy, or regulatory advice. It does not cover selling peptides for human consumption, dosing, injection, therapy, bodybuilding, weight loss, or treatment use.

Why Research Peptide eCommerce Is Different Now

A research peptide store has to do four jobs at once. It has to look credible to serious research buyers, stay acceptable to payment underwriters, avoid misleading health or therapeutic claims, and remain easy for your internal team to manage as lots, COAs, and inventory change.

Competitor guides from Beenacle, Tech Hikers, and onPoint all recognize the same core reality: research peptide websites fail when founders choose the wrong platform, treat compliance as a footer disclaimer, or wait until the end to solve payment processing. Beenacle frames the store around credibility, compliant content, COA management, and operational efficiency. Tech Hikers emphasizes that payment processor requirements should shape the website before product pages are written. onPoint focuses on WooCommerce, RUO product pages, COA integration, high-risk gateways, and trust-focused design. 

The missing piece is that a peptide research website should be built like a controlled commercial system, not a simple catalog. Your disclaimers, category structure, checkout confirmations, COA links, email flows, chatbot behavior, refund policy, and product descriptions all need to support the same research-use-only positioning.

In 2026, “research use only” language by itself is not enough. FDA warning letters show that regulators can review the full website, product names, claims, and social media context when deciding whether products are being marketed as unapproved drugs. In one FDA warning letter, the agency reviewed a peptide seller’s website and social media presence and stated that certain products were unapproved new drugs introduced or delivered for introduction into interstate commerce. 

Step 1: Define the Business Model Before You Build

Before choosing WooCommerce, Shopify, hosting, or a peptide website builder, define exactly what kind of business you are building.

A research peptide eCommerce store sells research-use-only products to qualified buyers for laboratory or research purposes. Its content should not speak to patients, consumers, athletes, wellness buyers, or people looking for self-use. The site should not include dosage guidance, injection instructions, disease language, “benefits” sections, before-and-after claims, or human outcome promises.

An online clinic or telehealth model is different. It may involve licensed providers, prescriptions, pharmacy fulfillment, HIPAA considerations, medical intake workflows, and healthcare advertising rules.

A pharmacy or compounding-adjacent model is also different. FDA’s page on certain bulk drug substances explains that some substances used in compounding may present significant safety risks, which is a separate regulatory conversation from RUO eCommerce. 

The mistake is blending these models. A site that says “research use only” on the footer but uses product copy around weight loss, recovery, anti-aging, injury repair, or protocols sends conflicting signals to regulators, payment processors, ad platforms, and search engines.

For a research peptide business, the cleanest model is narrow and consistent: research-use-only catalog, batch documentation, clear compliance language, qualified-buyer checkout, and no consumer medical framing.

Step 2: Build Compliance Architecture First

Compliance architecture is not one disclaimer page. It is the way the entire research peptide eCommerce website is structured.

A proper research peptide store compliance system should include clear RUO language on product pages, category pages, cart, checkout, footer, transactional emails, and packaging documentation. It should also include terms of sale, refund rules, shipping restrictions, customer qualification language, customer-service boundaries, and a process for reviewing every new product page before publication.

The most important rule is consistency. If a product page says “For Research Use Only,” the FAQ cannot answer “how much should I take?” If checkout confirms “not for human consumption,” the blog cannot discuss “best peptides for recovery.” If the homepage describes the brand as a research supplier, email flows should not talk about personal transformation, wellness, or performance.

A strong compliance framework removes risky language before it reaches the site. Avoid phrases such as “heals,” “fat loss,” “anti-aging results,” “injury recovery,” “injectable protocol,” “dose,” “stack,” “cycle,” “before and after,” “take,” “use on yourself,” or “patient results.”

Safer product copy focuses on identity, documentation, testing, storage, and research context. For example, instead of saying “supports recovery,” a compliant research-use-only page might say, “Supplied for qualified laboratory research with batch-specific documentation.” Instead of saying “best peptide stack,” use “related research compounds” only where appropriate and without implying combined human use.

This is where many new peptide research websites create unnecessary risk. They write for consumer demand first and try to add compliance later. A better sequence is to create a product-page template approved for RUO positioning before a single SKU goes live.

Step 3: Choose the Right Peptide eCommerce Platform

For most research peptide eCommerce stores, WooCommerce is the strongest platform choice because it gives you control over product-page structure, checkout language, high-risk payment integrations, COA workflows, redirects, schema markup, and hosting.

This does not mean WooCommerce is always better for every business. It means WooCommerce is usually better for a high-risk research chemical eCommerce build where platform flexibility matters more than convenience.

Shopify is attractive because it is fast and easy to launch. The problem is that peptide stores often need specialized payment gateways, checkout disclaimers, site-wide RUO language, and backup payment routes. Shopify Payments also operates through payment processors and has eligibility, underwriting, prohibited-business, and restricted-business requirements. Its terms explain that additional information may be required to verify identity and assess business risk, and that failure to comply with these requests may result in suspension or termination. 

Shopify’s Shop channel also lists prohibited product types that include drugs and drug-related products, medication, medical devices, hazardous and non-shippable materials, and other restricted categories. 

For a WooCommerce peptide store, the ideal stack usually includes managed WordPress hosting, WooCommerce, a lightweight theme or custom build, Cloudflare or another CDN, a COA document system, age or buyer verification, conditional checkout confirmations, fraud screening, high-risk gateway support, and backup payment options.

A research peptide website development project should not begin with “Which theme looks good?” It should begin with “What platform lets us control compliance, payment, COA, SEO, and fulfillment without rebuilding later?”

Step 4: Solve Research Peptide Payment Processing Before Design

Payment processing is often the hardest part of launching a research peptide eCommerce store. New founders frequently build the site first, upload products, write copy, and then apply for Stripe, PayPal, Shopify Payments, or Square. That sequence creates problems.

Mainstream processors generally have strict policies around regulated, restricted, or high-risk products. Stripe states that some businesses and product categories cannot use its services and that businesses must remain compliant with its rules and restrictions. PayPal’s Acceptable Use Policy restricts transactions involving narcotics, steroids, certain controlled substances, products that present consumer-safety risks, drug paraphernalia, and activities that violate laws or regulations. 

That does not mean every research peptide business is automatically impossible to process. It means payment processing must be planned before buildout. A high-risk merchant account provider may want to see your product catalog, supplier documentation, COA process, refund policy, fulfillment policy, customer qualification language, website copy, and prohibited-claims policy.

Your payment underwriting folder should be prepared before launch. It should include your legal entity documents, EIN, ownership information, product list, supplier documentation, sample COAs, shipping policy, refund policy, terms and conditions, RUO statement, chargeback SOP, fulfillment SOP, and screenshots of the checkout flow.

The payment section of your website should be built around processor expectations. If a processor requires specific research-only confirmations before purchase, those need to be coded into checkout. If the processor requires certain terms or refund language, that should be in place before underwriting review.

In practical terms, payment processing is not an integration step. It is a design input.

Step 5: How Much Does It Cost to Launch a Research Peptide eCommerce Store?

The cost to launch a research peptide eCommerce store depends on how serious the business is about compliance, payment stability, COA management, product-page structure, and fulfillment operations. A basic WooCommerce store can be built for far less than a custom eCommerce system, but a research peptide website should not be priced like a simple brochure site, generic Shopify store, or low-risk retail website.

For a research peptide business, the real cost is not just “website development.” The budget should include compliance planning, high-risk payment readiness, COA architecture, product-page templates, checkout language, security, fulfillment workflows, SEO, and ongoing maintenance.

A realistic launch budget may include:

Cost area	What it covers	Planning range
Business setup and advisory	Entity setup, tax setup, legal/compliance review, policy review	Varies by advisor
WooCommerce website development	Design, product templates, checkout, mobile UX, speed optimization	$5,000–$25,000+
Advanced custom build	Custom COA system, buyer verification, complex integrations, custom workflows	$25,000–$80,000+
Hosting and security	Managed WordPress hosting, SSL, CDN, backups, malware protection	$50–$500+/month
COA and documentation system	Batch-specific COA pages, lot tracking structure, PDF management, product mapping	$1,000–$10,000+
Payment processing setup	High-risk gateway setup, underwriting preparation, ACH/eCheck, fraud tools	Varies by provider
High-risk processing fees	Card processing, chargeback fees, reserves, gateway fees	Often higher than standard processing
SEO and content foundation	Launch pages, category copy, product templates, compliance-safe blog structure	$2,500–$15,000+
Ongoing maintenance	Updates, backups, technical support, product/COA updates, SEO improvements	$500–$5,000+/month

High-risk merchant accounts often cost more than standard payment processing because processors take on more underwriting, regulatory, chargeback, and fraud exposure. Processing rates, rolling reserves, chargeback fees, and approval requirements can vary widely based on product category, claims, refund history, business documentation, and processor risk tolerance.

The cheapest build is rarely the cheapest outcome. A low-cost peptide website may still need to be rebuilt if the product pages create compliance risk, the payment processor rejects the checkout flow, COAs are not mapped to active lots, or the platform cannot support the required gateway. In this vertical, the expensive mistake is usually building fast and fixing later.

For most serious founders, the better approach is to budget in phases:

1. Launch readiness audit — confirm platform, compliance structure, payment path, COA workflow, and product-page rules before design starts.
2. MVP WooCommerce build — launch with the correct architecture, compliant product templates, payment-ready checkout, and core SEO pages.
3. Growth buildout — add content clusters, automation, analytics, buyer accounts, advanced COA features, and conversion optimization.
4. Ongoing support — maintain plugin security, update COAs, improve SEO, monitor checkout performance, and refine product/category pages.

The right question is not “What is the cheapest way to build a peptide store?” The better question is: “What does it cost to build a research peptide eCommerce store that can pass payment review, support batch-level trust, avoid risky claims, and scale without a rebuild?”

Step 6: Create a Batch-Specific COA Management System

A research peptide store without visible, batch-specific COAs will struggle to earn trust. Serious buyers want documentation. Payment underwriters may also look for quality-control signals. Search engines and answer engines increasingly reward pages that show expertise, transparency, and proof.

A basic “COA available upon request” message is weak. A generic PDF is also weak if it is not tied to the current lot. A stronger research peptide COA management system connects each product page to the active lot and its supporting documentation.

The structure should look like this: product SKU, compound name, lot number, current inventory, COA file, lab name, test method, test date, purity result, and retest or expiration information where applicable. When inventory rotates to a new lot, the product page should update with the new COA.

A strong COA area on a product page may include HPLC purity, mass spectrometry or LC-MS confirmation, endotoxin testing where relevant, third-party lab verification, and a visible lot number. The goal is not to overwhelm the buyer with jargon. The goal is to make product quality verifiable.

For SEO and AEO, COA content also helps answer high-intent questions such as “what should a peptide COA include,” “how to verify peptide purity,” and “batch-specific COA vs generic COA.” The safest way to cover those topics is through documentation and research context, not human-use claims.

Step 7: Build Product Pages That Rank Without Making Medical Claims

Product pages are where many peptide eCommerce websites either win trust or create risk. The safest product-page template avoids benefit-led language and focuses on research documentation.

A strong research peptide product page should include the product name, a clear “For Research Use Only” designation, a short research-context description, specifications table, purity information, lot number, batch-specific COA link, storage and handling information, shipping details, and buyer qualification language.

The page should not include dosage, injection instructions, personal outcomes, disease claims, before-and-after content, “who should take this,” “how to use,” or “best stack” language. Even FAQ sections should be carefully controlled. Instead of answering “How much should I use?” the page should state that the product is not intended for human or veterinary use and that the company does not provide dosing, administration, or medical guidance.

For SEO, use natural product and category language without chasing risky traffic. Terms like “research peptide product page,” “COA documentation,” “research-use-only peptide,” “batch-specific testing,” “HPLC COA,” and “third-party lab verification” are safer than terms related to self-use, dosing, body composition, or treatment outcomes.

The best product pages do not try to sound like pharmacies, supplement brands, or wellness clinics. They sound like organized research supply pages with clear documentation.

Step 8: Design for Trust, Not Hype

Trust matters more than design flair in this vertical. A research peptide eCommerce website should look clean, technical, fast, and stable. Overly aggressive sales copy, flashing discounts, countdown timers, wellness imagery, or bodybuilding visuals can undermine compliance and trust.

Good design supports three decisions: Can the buyer verify the product? Can the buyer understand the purchase terms? Can the buyer complete the checkout without confusion?

Trust signals should include clear business information, accessible support policies, visible COAs, transparent shipping timelines, product documentation, secure checkout, consistent RUO language, and a professional About page. Mobile design also matters because many buyers compare suppliers on mobile before completing an order later.

Avoid generic “premium quality” claims unless they are supported by documentation. Replace vague trust claims with visible systems: lot-level COAs, testing methodology, supplier qualification process, fulfillment cutoff times, and customer support boundaries.

In a research peptide store, trust is built through evidence and structure, not hype.

Step 9: Set Up Hosting, Security, and Site Performance Correctly

A peptide research website can become file-heavy because of COA PDFs, product images, documentation, and recurring customer logins. Cheap shared hosting can create speed, reliability, and security problems.

A serious WooCommerce peptide store should use managed WordPress hosting, SSL, server-level caching, a CDN, malware scanning, automated backups, and a staging environment. Product and COA pages should load quickly. Checkout should be stable. The admin area should be secure with role-based access and strong login protection.

Performance is not only an SEO issue. It is also a conversion issue. If a product page is slow, COA files are difficult to open, or checkout feels unstable, buyers are less likely to trust the store.

Technical SEO should be part of the build from the beginning. Clean URLs, crawlable category pages, internal links, schema markup, optimized images, and fast Core Web Vitals all help the site compete without relying on risky claims.

Step 10: Build Fulfillment and Lot Tracking Before Launch

Research peptide fulfillment is not just “print a label and ship.” Your fulfillment system should connect inventory, lots, COAs, storage conditions, shipping policies, and customer communication.

Before launch, document how inventory is received, how lots are logged, where COAs are stored, how products are packed, what shipping carriers are used, what happens if a shipment is delayed, and how recalls or quality issues would be handled.

Customer service also needs boundaries. Support reps should be trained not to provide medical advice, dosing advice, administration instructions, or human-use guidance. If you use a chatbot or AI agent, it must refuse dosage, injection, therapy, or personal-use questions and redirect customers to research-use-only policies.

Fulfillment SOPs are part of the store’s trust system. They also help with payment underwriting because they show that the business is not a casual storefront with no operational controls.

Step 11: Plan SEO and AEO From Day One

SEO for a research peptide eCommerce store is not about publishing as many peptide articles as possible. It is about building topical authority around safe, research-focused, documentation-led topics.

A strong content architecture should include one main hub page for launching a research peptide eCommerce store, then supporting pages around WooCommerce peptide store setup, high-risk payment processing, COA management, RUO compliance, product-page templates, fulfillment SOPs, and California or Los Angeles launch requirements.

Answer Engine Optimization, or AEO, means your content should answer specific buyer questions clearly enough to be used in AI-generated summaries, featured snippets, and voice-style responses. Each major section should answer one direct question.

For example:

What is the best platform for a research peptide eCommerce store?
For most research peptide eCommerce stores, WooCommerce is usually the strongest option because it offers more control over checkout, payment gateways, COA management, product templates, and compliance language than closed platforms.

What should a peptide product page include?
A compliant research peptide product page should include RUO labeling, product specifications, batch-specific COA access, lot number, storage information, shipping details, and buyer qualification language. It should not include dosage, injection, benefits, treatment claims, or human-use instructions.

Can a research peptide store use Google Ads?
Google restricts promotion related to prescription drug services and restricted drug terms, including rules that can apply to ads, landing pages, and keywords. A research peptide store should not assume paid search will be available or stable without specialist policy review. 

For SEO, the safest keyword strategy uses terms like research peptide ecommerce store, peptide ecommerce platform, WooCommerce peptide store, research peptide COA management, research peptide payment processing, peptide business compliance checklist, and research-use-only peptide eCommerce. Avoid ranking strategies built around dosage, effects, recovery, weight loss, injection, or consumer self-use.

Step 12: Los Angeles and California Considerations

If you are launching from Los Angeles or serving California buyers, local compliance matters. A Los Angeles research peptide business may need city, state, tax, storage, and product-warning reviews before launch.

The City of Los Angeles Office of Finance states that individuals or entities conducting business activities within the City of Los Angeles are required to apply for and obtain a Business Tax Registration Certificate. California’s CDTFA states that a seller’s permit is required for businesses engaged in business in California that intend to sell or lease tangible personal property normally subject to sales tax. 

California also has operational rules that may become relevant depending on what is stored and how inventory is handled. CalEPA explains that the Hazardous Materials Business Plan program is designed to prevent or minimize harm from releases or threatened releases of hazardous materials, and HMBPs can include hazardous-material inventories, emergency response procedures, and employee training requirements. 

Prop 65 should also be reviewed. California’s OEHHA states that businesses with 10 or more employees that expose individuals to listed chemicals through products or operations generally must provide warnings. 

Do not treat this as a simple “LLC plus website” launch. If you are operating from LA, storing inventory in LA County, or selling into California, speak with qualified legal, tax, and compliance professionals before going live.

How COLAB Helps Research Peptide eCommerce Brands Build Smarter

COLAB is best positioned in this article as the strategic build partner for founders who need more than a nice-looking peptide website. The real challenge is not just design. It is building a research peptide eCommerce website that connects compliance-aware content, SEO, paid-media caution, conversion strategy, and local Los Angeles market understanding.

COLAB Los Angeles positions itself around digital marketing, branding, web design, SEO, PPC, content strategy, and helping businesses grow online. Its own content emphasizes that local Los Angeles SEO works best when it reflects real local context instead of simply adding “Los Angeles” or “near me” terms, and it describes LA as a diverse, competitive market made up of micro-neighborhoods. 

For a research peptide eCommerce store, that matters. A founder in Los Angeles does not only need a WooCommerce build. They need a content and conversion system that understands search demand, compliance limits, local business context, landing-page structure, and how to avoid wasting budget on channels that may not accept the category.

A COLAB launch plan for a research peptide store should focus on:

• Compliance-first website strategy before design
• WooCommerce peptide store architecture
• SEO and AEO content planning
• Product-page templates with RUO positioning
• COA and trust-signal placement
• Conversion-focused landing pages
• High-risk payment readiness support
• Los Angeles and California content localization
• Analytics and conversion tracking
• Safe content guidelines for ads, email, blogs, and customer support

The strongest positioning for COLAB LAX is simple: build the store in the right order before money is spent on the wrong platform, risky messaging, or an underwriter-unfriendly checkout.

Common Mistakes That Kill New Research Peptide Stores

Many new peptide stores fail before they have a chance to rank or convert. The issue is rarely that the founder did not care. The issue is usually that they are built in the wrong order.

The first mistake is choosing the platform before understanding payment requirements. A beautiful site is useless if the payment processor rejects the product pages, checkout flow, or compliance language.

The second mistake is treating COAs as an afterthought. Serious buyers expect batch-specific documentation. A product page with no visible COA, no lot number, or a generic PDF looks weak.

The third mistake is copying supplement or wellness brands. Research peptide eCommerce should not use benefit-led claims, body-transformation language, clinical-sounding promises, or “protocol” content.

The fourth mistake is assuming paid ads will be easy. Google restricts healthcare and medicine-related advertising in ways that can affect ads, landing pages, keywords, and certification requirements. A store should have an SEO and owned-channel plan rather than relying only on paid acquisition.

The fifth mistake is installing a generic AI chatbot. A normal chatbot may answer dosage, injection, or human-use questions unless it is configured with strict compliance boundaries.

The sixth mistake is skipping local compliance. For LA and California businesses, business registration, seller’s permit obligations, Prop 65 review, and storage-related compliance may all matter depending on the business model.

The final mistake is writing for traffic instead of trust. Chasing keywords around effects, benefits, injections, and human use may attract clicks, but it can damage compliance, payment stability, and long-term authority.

Research Peptide Store Launch Checklist

Before development starts, make sure the business has the right inputs in place.

• Confirm the business model first. Decide whether the site is a research-use-only store, clinic, telehealth model, or pharmacy-adjacent business. Do not mix these models.
• Prepare your compliance structure. Create RUO language, checkout confirmations, terms of sale, refund policy, restricted-claims rules, and customer-support boundaries.
• Choose the platform based on control. For most stores, WooCommerce is the preferred peptide eCommerce platform because it gives more flexibility for compliance, COAs, payment gateways, and SEO.
• Start payment processing early. Build an underwriting folder before launch and understand processor requirements before writing product pages.
• Create the COA system. Every relevant product should connect to batch-specific documentation, lot information, and testing details.
• Build product-page templates before adding SKUs. A consistent template prevents risky language and improves search structure.
• Document fulfillment SOPs. Include inventory intake, lot tracking, packaging, shipping, damaged orders, returns, and recall procedures.
• Plan SEO and AEO. Build a content cluster around compliance, WooCommerce, COAs, payment processing, product-page structure, and fulfillment, not dosing or human-use topics.
• Review LA and California requirements. Check city registration, seller’s permit obligations, Prop 65, storage rules, and any local requirements with qualified advisors.

Final Takeaway

A research peptide eCommerce store is won before the first product goes live. The founders who succeed will not be the ones who launch the fastest. They will be the ones who build the right foundation first: research-use-only compliance, WooCommerce control, high-risk payment readiness, batch-specific COAs, fulfillment SOPs, technical SEO, and safe content architecture.

The right question is not “How quickly can we build a peptide website?”

The better question is:

Can this store survive payment underwriting, regulatory scrutiny, serious buyer review, SEO competition, and daily operations after launch?

If the answer is yes, you have more than a website. You have a real research peptide eCommerce business foundation.

FAQs

What is the best platform for a research peptide eCommerce store?

For most research peptide eCommerce stores, WooCommerce is the strongest platform because it gives the business more control over payment gateways, checkout language, COA management, product-page templates, compliance disclaimers, and SEO structure. Closed platforms may be easier to launch but can create problems when the business needs high-risk payment processing or custom compliance workflows.

Can I sell research peptides on Shopify?

Shopify may not be the safest platform for peptide eCommerce because of platform rules, payment limitations, restricted categories, and reduced checkout flexibility. Shopify Payments has underwriting and prohibited/restricted business review requirements, and Shopify’s Shop channel prohibits several categories related to drugs, drug-related products, medication, medical devices, hazardous materials, and other sensitive items. 

What should a research peptide product page include?

A research peptide product page should include RUO labeling, product specifications, lot number, batch-specific COA, testing method, storage information, shipping details, and buyer qualification language. It should not include dosage, injection instructions, human-use claims, treatment claims, recovery claims, weight-loss claims, or “best peptide stack” content.

Do research peptide stores need high-risk payment processing?

In most cases, yes. Research peptide payment processing is typically treated as high risk by payment providers because of regulatory sensitivity, product category risk, chargeback risk, and underwriting requirements. Founders should speak with payment professionals before building the site so the checkout, product pages, and policies match processor expectations.

Are COAs required for peptide eCommerce?

A Certificate of Analysis is one of the most important trust signals for a research peptide store. The strongest setup uses batch-specific COAs tied to the current lot on each product page. Serious buyers want to verify product documentation before purchasing.

Can a research peptide store use Google Ads?

A research peptide store should not assume Google Ads will be available or stable. Google restricts prescription drug services and restricted drug terms, including ad copy, landing pages, and keywords in certain contexts. Any paid-media plan should be reviewed by policy specialists before launch. 

What should I avoid writing on a peptide research website?

Avoid dosage, injection, medical, therapeutic, bodybuilding, anti-aging, weight-loss, recovery, disease, and self-use language. Also avoid before-and-after content, testimonials implying human results, and AI chatbot answers that provide medical or dosing guidance.

What does a Los Angeles peptide eCommerce business need before launch?

A Los Angeles business should review city business registration, California seller’s permit requirements, storage rules, Prop 65 obligations, insurance, and compliance documentation before launch. The City of Los Angeles requires businesses conducting activity in the city to apply for a Business Tax Registration Certificate, and the CDTFA requires a seller’s permit for businesses engaged in California that sell tangible personal property normally subject to sales tax.