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Cards v3 Direct API Integration

The full card integration instructions are maintained in the Payins (v3) guide.

Use POST /v3/payment with a non-empty paymentData object containing valid card details or a saved card token. Missing or invalid card data can return HTTP 400 before a transaction is created. Other missing information or 3D Secure authentication can require a cashier redirect.

The guide includes card request examples, signature instructions, and retry behavior.