Based on the response you provided, it seems that the payment processing failed with a generic error and no specific error message was provided. However, there are a few things you can do to try and troubleshoot the issue:
Contact Paysera support: It’s possible that there is an issue on their end that is causing the payment to fail. Contacting their support team may help you identify any issues and resolve the problem.
Check your payment gateway settings: Make sure that your payment gateway settings are configured correctly. Check your API keys and any other relevant settings to ensure that they are correct.
Check for conflicts with other apps: If you have recently installed or updated any other apps on your Shopify store, it’s possible that there is a conflict with the Paysera app. Try disabling any recently installed or updated apps and see if that resolves the issue.
Check your payment provider’s documentation: Check the Paysera documentation to see if there are any known issues or troubleshooting steps that you can follow. They may have specific instructions for resolving payment processing errors.
Test with a different payment method: Try using a different payment method to see if the issue is specific to Paysera. If a different payment method works, it’s likely that there is an issue with Paysera and you should contact their support team