API Integration Planning

Plan API integration for this Custom GPT:

ACTION NEEDED:
[What external capability is required]

POTENTIAL APIS:
[Options you've identified]

INTEGRATION PLAN:

API SELECTION:
- Compare options on: reliability, cost, documentation, rate limits
- Recommendation and rationale

AUTHENTICATION:
- What auth method does the API use?
- How to handle securely in GPT Actions

ENDPOINT MAPPING:
- What endpoints are needed?
- What data flows in each direction?

SCHEMA DESIGN:
- What parameters does the GPT need to send?
- What response format to expect?
- How to handle errors?

USER EXPERIENCE:
- How should the GPT present API-retrieved information?
- What if the API is slow or unavailable?

Draft the OpenAPI schema structure for this integration.