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This step is only required if the response from the 3DS Auth API (Step 3) indicates the challengeRequired property is true. Inside this response will be another redirectUrl property.

There are two possible flows:

  1. ACS challenge iframe

  2. Full browser redirect to ACS challenge page (If a merchantRedirectUrl was provided in the Init Call in Step 1)

ACS challenge iframe

If a merchantRedirectUrl was not supplied, create an iframe to contain the ACS challenge.

Set up iframe html

Use the redirectUrl as the src property.

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