We have 

<message name="IDS_PAYMENTS_CARD_NUMBER_INVALID_VALIDATION_MESSAGE" desc="The text that informs the user that the credit card number they have entered is not valid." formatter_data="android_java">
    Invalid card number
  </message>

And 

  <message name="IDS_PAYMENTS_CARD_NUMBER_INVALID" desc="The label to indicate payment card number is invalid." formatter_data="android_java">
    Card number invalid
  </message>

in payments_strings.grdp