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Depending on the content of the received threedsdata block (units 3, 4, 5), the authentication proceeds differently.
Main work scenarios:
For version 3D-Secure 2.0 (unit 3), if there is the issuing bank URL threeDSMethodURL (unit 5), the enterprise generates hidden HTML iFrame on the payment page (unit 8) and sends a POST request with one parameter threeDSMethodData to the received address threeDSMethodURL, and then calls the get3dsecver2 service (unit 9).