did not save credit card details although transaction was succeeded

[mtgrepo]

Hello,
When I fork this module and implement the custom payment gateway, all of the transaction were succeeded but the request was stacked in the checkout page and did not save the card information as below picture.

And this error shows "The credit card details you entered were declined. Please try a different card or contact support". Please let me know is there something is needed to use local storage? Because some payment gateway providers do not support the tokenised remote storage _storeremote.

But the invoice was made paid.