meta.code vs meta.constant

[nschloe]

Sometimes, error codes are given in meta.code, other times in meta.constant. What's that about?

[ezekg]

I take it you’re referring to validation codes, not error codes. You’re likely using multiple accounts that have different pinned API versions. In API v1.2, we renamed meta.constant to meta.code (see changelog entry for July 2022). When we make a breaking API change, we do it in a “backwards compatible” way via versioning (further detailed in our API versioning docs).

I’d recommend pinning your integration to a specific API version via the Keygen-Version header. For example:

Keygen-Version: 1.3

This will force your requests to use a specific version, regardless of what the account’s pinned version is.