Request validation

What every request is checked for, and the errors you may receive.

Every request is validated in the following order. The first check that fails determines the response:

Order	Check	Failure
1	Valid API key	401
2	API access enabled for your plan	403 api_access_disabled
3	Access to the requested resource enabled	403 api_module_access_disabled
4	Not currently rate limited or temporarily blocked	429 rate_limit_exceeded
5	Request payload is valid	4xx (see Response format)

See HTTP status codes for the full list and Rate limits for 429 handling.