One of the backend systems involved by the API implementation enforces rate limits on the...

Including logic within the API implementation that bypasses in locations of the back-end system in the staging environment and invoke a Mocking service that replicates typical back-end system responses

Then conduct performance test using this API implementation

Use MUnit to simulate standard responses from the back-end system.

Then conduct performance test to identify other bottlenecks in the system

Create a Mocking service that replicates the back-end system's

production performance characteristics

Then configure the API implementation to use the mocking

service and conduct the performance test

Conduct scaled-down performance tests in the staging environment against rate-limiting back-end system. Then upscale performance results to full production scale