Quickstart
Make your first API call in minutes — set up keys, encrypt a request, and verify the response.
Authentication
Learn how RSA keys and AES session encryption work together to secure every API call.
API Reference
Full reference for all 40+ endpoints across merchant access, collection, FX, payments, and accounting.
Guides
Step-by-step walkthroughs for onboarding, collection, currency exchange, and international transfers.
What You Can Build
Collections
Open virtual accounts and receive payments from customers worldwide.
FX & Exchange
Get real-time quotes and execute currency conversions programmatically.
International Transfers
Send cross-border remittances to beneficiaries in supported countries.
RMB Payments
Initiate domestic CNY payments to Chinese bank accounts.
Payouts
Withdraw settled funds to your linked bank account.
Accounting
Query account balances and full transaction history in real time.
How It Works
1
Onboard your merchant account
Submit your merchant KYC details via sp1101. Gcashier Pay reviews your application and activates your account.
2
Exchange RSA public keys
Generate a 2048-bit RSA key pair, share your public key with Gcashier Pay, and receive Gcashier Pay’s public key in return. These keys secure every API message.
3
Integrate and test
Use the sandbox environment to test your integration with mock endpoints. Validate encryption, signing, and webhook delivery.
4
Go live
Provide your production server IP, exchange production RSA keys, and switch your base URL to the production environment.
All API requests use HTTPS 1.2 with JSON payloads. Messages are AES-encrypted and RSA-signed — see Encryption & Signing for the full specification.