How to know if the entered card is Invalid?

[Xunds]

I am using VCES. When I submit iFrame it returns statusCode, CorrelationId and IsEligible="False". Can you tell me how do I know the entered card is invalid? Secondly, Why it returns false for eligibility?

[API_Products]

Hi @Xunds,

To further investigate, please provide the following information:

1. End Point

2. Request Header

3. Request Body

4. Response Header (include the x-correlation-id)

5. Response Body