Flutter Square InApp Payments SSL Handshake and Security Check Error

[tchuong2ca]

I am integrating Square In-App Payments using the square_in_app_payments library version 1.7.12 with the Flutter framework, and I am testing in the production environment.

Test devices:

• iOS: iPhone 13

• Android: Xiaomi Mi 10S

Test card information:

• Card type: Visa

• Issuing bank: Vietcombank (VCB)

• Country: Vietnam

Observed behavior:

• Visa cards issued by other banks work normally in the same production environment.

• When entering the Vietcombank Visa card details (card number, expiration date, CVV) and tapping Save, a popup with the Visa logo appears, indicating that the payment flow has started and is attempting to connect to the card issuer / bank for authentication.

• Shortly after this popup appears, the process fails with the following errors:

On iOS:

• “Something went wrong. Please contact the developer of this application and provide them with this error code: unexpected”
  or

• “Could not establish SSL handshake. Error code: [204]”

On Android:

• “Device has failed the internal security checks. If you are testing on an Android Emulator, please switch to the Sandbox environment. Failed checks: [Warning(id=SW02, message=The integrity of the SDK has been tampered., severity=HIGH)]”
  or

• “Could not establish SSL handshake. Error code: [204]”

Additional details:

• After the “Device has failed the internal security checks” error occurs, subsequent attempts to save other cards also fail with the same error.

• If the Vietcombank Visa card is not entered first, other Visa cards can be saved and charged successfully.

• This state persists until the app is restarted.

[_Violet · Accepted solution]

Hi @tchuong2ca and thanks for reaching out to the Square Community 👋

It looks like you're located in a country where card payment acceptance isn't supported. Card payment acceptance with the Square app is currently available in the US, Canada, Australia, Japan, the United Kingdom, Republic of Ireland, France and Spain. We currently don’t support payment card processing outside of these countries or in U.S. territories. We’re working to bring payment processing to more markets and will share updates on squareup.com/news.

I hope this information is helpful, but please do let me know if you have any additional questions.