Prerequisites {#concept_q1d_j1x_wpb}
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Notify your account representative that you want to implement payer authentication (3-D Secure) using the Direct API integration. Provide the merchant ID that you will use for testing. For more information, see [Required Merchant Information](/docs/cybs/en-us/payer-authentication/developer/all/so/payer-auth/pa2-intro-intro/pa2-intro-process-overview.md "").  
Before you can implement payer authentication services, your business team must contact your acquirer and `Cybersource` to establish the service. Your software development team should become familiar with the API fields and technical details of this service.