Fix payment response handling and validation

[acasazza]

What I did

Corrected the handling of payment response statuses and added validation for the payment component before form submission. Cleaned up the code structure by removing unused imports.

How to test

1. Test payment processing to ensure response statuses are handled correctly.
2. Validate the payment component before submission to confirm it prevents invalid submissions.
3. Review the code structure for any inconsistencies or unused imports.

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

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