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The retry mechanism for integrating with an external API is a process that automatically retries failed API requests for a certain number of times before giving up. The retry mechanism typically includes the following components:

1. Error handling: The system should be designed to detect and capture errors that occur during the API request.

2. Backoff strategy: The retry mechanism should include a backoff strategy that determines how long the system waits between retries. This can be a fixed delay, an exponential backoff, or a combination of both.

3. Retry limit: There should be a maximum number of retries that the system attempts before giving up on the API request.

4. Exponential backoff: As failed retries occur, the system should increase the delay time of retries exponentially, to prevent overloading the external API.

5. Failover: If the external API is down or experiencing issues, the system should have a backup API to failover to.

6. Logging: The retry mechanism should include logging to help diagnose errors and identify patterns of failure.