You need to verify the integration of card authorizations between the banking system and external processing. Choose the most comprehensive testing approach: - Conduct final testing directly in the production environment - Check main operations via REST client - Only verify successful scenarios using API testing tools - Positive + negative scenarios + load testing

The most comprehensive approach to testing the integration of card authorizations between the banking system and external processing is to conduct positive and negative scenarios, as well as load testing. This comprehensive approach allows testing not only the correctness of operation under normal conditions but also the system's resilience to errors and high load.

• Positive scenarios verify correct operations.
• Negative scenarios identify the system's behavior in case of errors and incorrect data.
• Load testing assesses performance and stability under stress.

Conducting final testing in a production environment is risky and not recommended without prior comprehensive testing in a test environment.