Request Endpoints {#pa2-intro-endpoints}
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When posting a request for payer authentication, you must add an endpoint to each hostname, whether you are using the test environment or the production environment. These endpoints are used with payer authentication.  
`/risk/v1/authentications`: use when verifying that a card is enrolled in a card authentication program or requesting authentication from the issuer.  
`/risk/v1/authentication-results`: use when retrieving and validating authentication results from the issuer so that the merchant can process the payment.  
`/pts/v2/payments`: use when bundling multiple payments together.  
For example, a test request might look like this:  
`POST ``https://apitest.cybersource.com``/risk/v1/authentications`