Platform overview

FIN is a payment platform for businesses (partners) that collect money from their customers, send money back to them, and want to follow every payment in one place.

In these docs, your customer who sends or receives money is called the payer.

What you can do

Pay-ins

Create a pay-in for a payer, who then scans a PromptPay QR code or transfers to the account shown. The platform matches the incoming money to the pay-in automatically.

Payouts

Send money from your balance to a payer’s bank account, for example a winnings withdrawal or a refund.

Balance

Successful pay-ins, minus fees, go to your balance. Use it for payouts, withdraw it to your company account, or add funds to it.

Console

Search payments, read the details, manage payers and your team, and download reports in a web browser.

Your systems connect through the Partner API (server to server). Your team uses the console at https://portal.finixpay.app.

Pay-in methods

Method	What the payer does	Notes
PromptPay QR	Scans the QR code with a banking app; the amount is filled in	The main method. A QR code works for one pay-in only
Bank transfer	Transfers the exact amount shown, to the account shown on the payment page	In some cases the platform uses this instead of QR automatically
Crypto (USDT)	Sends to the wallet address shown	Only for accounts with this service enabled

With the automatic method the platform picks a suitable method and tells you which one it used.

The amount to pay can have extra satang

To match payments reliably, the platform may add 0.01–0.99 THB to the amount the payer must transfer. For a 1,000 THB pay-in, the payer might transfer 1,000.82 THB. See the pay-in lifecycle.

Who uses the platform

• Partner owner: manages the account, team, API keys, balance and reports.
• Partner operators: follow payments and help payers who have a problem.
• Partner risk: reviews payments and payers.
• Partner group: sees several partner accounts that belong to the same owner.
• Referrer: follows the fee share earned from referred partners.

What each role may do is on Roles and permissions.

Next

Getting startedWhat to do before going live

Key conceptsPayments, statuses, balance and fees

Pay-in lifecycleFrom creation to succeeded or expired

Partner APIFor developers