Terminal payments

Push amount + currency from your CRM/POS to a signed-in MainMoney terminal. The cashier finishes the sale on the device (palm, phone, QR, or cash). Your backend learns the outcome from signed webhooks.

vs payment links

	Payment links	Terminal payments
Where the payer pays	Hosted MainMoney URL	In-store terminal
Who chooses the method	Payer on the web page	Cashier on the device
Your job	Create link + redirect	Create payment + handle webhook

Five steps

1. Authenticate with OAuth client credentials.
2. Discover merchants (GET /merchants) and terminals (GET /terminals).
3. Create a terminal payment (POST /terminal-payments) with merchantReference.
4. The signed-in terminal prefills amount and currency; the cashier chooses the method.
5. Receive terminal_payment.* webhooks (or poll GET /terminal-payments/:id).

Next

• Quickstart — curl happy path
• Open-source demo — Express sample with ngrok webhooks
• Create payment · Terminals · Webhooks