Payment gateway doesn't work

Problem/Motivation

When i install the module and choose amazon pay as method payment i get this error.

We encountered an unexpected error processing your payment. Please try again later.

there is no much useful informations in logs, i tracked the exception it's coming from commerce/modules/payment/src/Plugin/Commerce/CheckoutPane/PaymentProcess.php

catch (PaymentGatewayException $e) {
        $this->logger->error($e->getMessage());
        $message = $this->t('We encountered an unexpected error processing your payment method. Please try again later.');
        $this->messenger()->addError($message);
        $this->checkoutFlow->redirectToStep($error_step_id);
      }

anyone has this issue ?
I can help maintaining this module.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes