post https://api.pxp.net/api/v1/threedsecure/standalone/authentications
Pre-initiates a stand-alone 3D Secure authentication request for a transaction. This endpoint is used by merchants who utilise PXP's service solely for authentication purposes. The pre-initiation step gathers necessary information and ensures that all required data is available and valid before proceeding with the actual authentication request. This process helps to streamline the authentication process and enhance security.