post
https://sandbox.alloy.co/v1/custom-lists//append
Append entries to the latest minor version of a major version in place, without creating a new version. The entries are added to the existing version and the version string is unchanged. This differs from POST /custom-lists/{customListToken}/versions with an added body, which creates a new minor version. Appends always target the latest minor version of the specified major version.
400Bad request - Invalid Input Data, or the target version is not the latest minor version of the major version
403Forbidden - Insufficient Permissions
404Custom List or Major Version Not Found
409Conflict - An append is already in progress for this version