DRIVERS-2333 : Summary of required changes Create an internal cache for fetched AWS credentials used by the driver Add integration tests to verify cache usage Additional background Please see https://github.com/mongodb/specifications/commit/364761d3dae5e430b0812f23786b592f4bb629c1 for the specification change and https://github.com/mongodb/specifications/commit/745e486dd03f0d724c68593bf9ddb017d2d58fa6 for a follow-up to tests. Please see https://github.com/mongodb/mongo-csharp-driver/commit/3d67e80c3553051286afed4c3e7ba7aabcf7cba3  for a reference implementation in C#. Integration test Drivers are expected to add an integration test as described in the specification change