Home/GST Contact Search Guides/GST B2B Business Lookup for Platforms Onboarding Sellers
GST B2B Business Lookup for Platforms Onboarding Sellers
GST B2B business lookup as part of know-your-business checks for marketplaces and platforms: verify sellers’ GSTINs, match identities and keep contacts current.
GST Identification Number
27ABCDE1234F1Z0
- Legal nameSample Traders Pvt Ltd
- StateMaharashtra (27)
- RegistrationActive
- Phone+91 98XXX XXXXX
- Emailc****@example.com
Illustrative result. Get sample format for live records.
Reading time 3 min
Last reviewed October 2026
GST B2B business lookup is a core step for any platform that onboards businesses: online marketplaces, wholesale apps, logistics networks, payment aggregators and procurement portals. Each new seller or partner gives a GSTIN, and the platform must check that the business is real, that the person signing up represents it, and that its tax details are correct for invoicing and tax collection. This is know-your-business, or KYB, and the GSTIN is its anchor.
This guide sets out a practical KYB flow built around the GST lookup: what to verify, how to match identities, how to collect contacts, and how to keep the data fresh after onboarding.
Quick answer
- The GSTIN lookup confirms legal name, address, constitution and status.
- Match the GSTIN’s PAN and legal name with the applicant’s documents and bank account.
- Collect business contacts from the seller and verify them with OTPs.
- Recheck status regularly, since registrations get suspended and cancelled.
- Keep evidence of every check for audit and dispute handling.
Why Platforms Need KYB
Platforms are responsible for who trades on them. Fake sellers, borrowed GSTINs and shell businesses lead to fraud, counterfeit goods, chargebacks and tax problems. E-commerce operators also collect tax at source on sellers’ supplies, which requires correct GST details for every seller. A solid KYB flow protects buyers, honest sellers and the platform itself.
Step 1: Look Up the GSTIN
Validate the format and check digit as the seller types, then verify through an authorised data channel to fetch the legal name, trade name, constitution, status, registration date, principal place of business and activities. Reject cancelled and suspended registrations, and flag very recent ones for closer review.
Step 2: Match Identity
Compare the GSTIN’s legal name with the applicant’s PAN, and the PAN inside the GSTIN with the PAN document submitted. For companies and LLPs, check the corporate registry and match the signatory to a director or partner, or require an authorisation letter. Validate the bank account holder’s name against the legal name before enabling payouts.
Need the contact behind a GSTIN?Get the sample format with verified business contact fields.
Step 3: Collect and Verify Contacts
Ask the seller for a business mobile, a support email and, for larger sellers, an accounts contact. Verify the mobile and email with one-time passwords. These become the platform’s channels for orders, disputes and compliance notices, so they must be numbers the seller controls and has agreed you may use.
Step 4: Check the Place of Business
Compare the pickup address the seller enters with the places of business in the GST record. A pickup point that is not a registered place of business may be legitimate, such as a new warehouse not yet added, but should prompt a request to amend the registration. For high-risk categories, consider an address verification or video check.
Step 5: Ongoing Monitoring
After onboarding, recheck each seller’s GST status on a schedule and before large payouts. Watch for changes in legal name, constitution or address, and for cancellation. Ask sellers to update contacts through authenticated flows. Suspend selling when a registration is cancelled until the seller provides a valid one.
Want to see real match quality?See the sample format for your own GST numbers.
Keeping Evidence
Store the verification responses with timestamps, documents submitted, match results and the reviewer’s decision for manual cases. When a buyer complaint, tax query or fraud investigation arises, this record shows what the platform checked and when.
Balancing Speed and Safety
Sellers want to start quickly. Automate the GSTIN lookup, PAN match and OTP verification so most applicants pass in minutes, and send only exceptions to manual review. A clear message about what is missing, such as a bank name mismatch, helps genuine sellers fix it themselves.
Have a list of GSTINs?Send a few and we will return matching contact fields.
Related guides
Find Vendor Contact by GSTIN with a Proper Onboarding Form: a related guide.
Find Mobile Number with GST Number for Online Orders and Deliveries: a related guide.
Find GST Taxpayer Mobile Number Only After Checking Activity: a related guide.
Get GST Owner Mobile Number with Consent: a related guide.
Frequently Asked Questions
What is a GST B2B business lookup in seller onboarding?
A verification of the seller’s GSTIN that returns the legal name, status, constitution and places of business, used as the anchor for know-your-business checks.
Is a valid GSTIN enough to onboard a seller?
No. You must also match the PAN, registry details and bank account name to confirm the applicant represents the business.
How should platforms collect seller contacts?
Ask the seller for business contacts and verify them with OTPs, rather than looking them up elsewhere.
What if the pickup address is not in the GST record?
Ask the seller to add it as a place of business, and review high-risk cases more closely.
How often should seller GST status be rechecked?
On a regular schedule and before large payouts.
What evidence should platforms keep?
Verification responses with timestamps, documents, match results and reviewer decisions.
GST To Phone NumberWe help sales, procurement and compliance teams turn a GST registration number into a verified, reachable business contact.
Company
Get Sample Format
Send us a few GSTINs and we will return the matching contact fields so you can judge the data before you buy.
© 2026 GST To Phone Number. All rights reserved.
Disclaimer: GST To Phone Number is an independent data service. We are not affiliated with, endorsed by or connected to the Goods and Services Tax Network, the Central Board of Indirect Taxes and Customs, or any government department. GSTIN verification should always be confirmed against the official GST portal. Contact data is provided for legitimate business use and must be used in line with applicable telecom, privacy and data-protection rules.