The Checkbook API uses the following error codes:
Your request is invalid
Your API key is wrong
You do not have permission to access the requested endpoint
The specified endpoint could not be found
Method Not Allowed
You tried to access an endpoint with an invalid method
Too Many Requests
You’re sending too many requests! Slow down!
Internal Server Error
We had a problem with our server. Try again later.
We’re temporarily offline for maintenance. Please try again later.