3DS response codes

3DS response codes and what they mean for you.

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Errors

Why are my 3DS payments not being completed?
What does it mean if a payment is refused because 3d-secure: Authentication failed?
Why do I get an "Authentication required" response?
What does "Invalid paRes from issuer" mean?
What does the error code 701 with HTTP status 500 mean?

Statuses

Why was a 3D Secure 2 payment authorised with transStatus "A: Attempted to Authenticate from the ARes and without a challenge"?

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