# General notes for API users

- [Overview](https://postman-v2.guides.gov.sg/general-notes-for-api-users/overview.md)
- [Authentication](https://postman-v2.guides.gov.sg/general-notes-for-api-users/authentication.md)
- [API Errors](https://postman-v2.guides.gov.sg/general-notes-for-api-users/api-errors.md)
- [Message Delivery Errors](https://postman-v2.guides.gov.sg/general-notes-for-api-users/message-delivery-errors.md): Each error type is mapped to its corresponding code, as returned by the system, to diagnose delivery failures.
- [Pagination](https://postman-v2.guides.gov.sg/general-notes-for-api-users/pagination.md)
- [Rate Limits](https://postman-v2.guides.gov.sg/general-notes-for-api-users/rate-limits.md): This page will answer your questions on rate limits imposed on agency campaigns. This applies to all agencies.


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