Sandbox
Test Core without moving real money.
The Core sandbox is a complete, isolated copy of the production environment. You can create ledger accounts, issue cards, simulate authorizations, and trigger payouts — all without moving real money or affecting any real customer. It is the right place to develop your integration end-to-end before requesting production credentials.
Sandbox credentials are different from production credentials and the two are not interchangeable. Always confirm which environment your code is pointed at before running anything.
Before you start
You need a Mono account with sandbox access enabled, and sandbox credentials: an API key or an OAuth 2.0 credential, obtained as described in Authentication. Sandbox credentials only work against the sandbox base URL below.
Base URL
https://api.sandbox.cuentamono.comTest scenarios
Cards
Card creation states, activation, and controls
Card Transactions
Authorizations, declines, settlements, and reversals
Ledger
Ledger movements, subaccount operations, and fees
Payouts
Payout success, failure, and retry scenarios
Payins
Simulate a payer paying your templates and intents