The residence country of the user. This should be an Alpha-2 code. (e.g., US, GB, DE)

The email address of the user that would be registered. This address should be unique, otherwise, the request will fail.

EOA of the user, compliant with the format of the chain you're using. This address should be unique, otherwise, the request will fail. Preferred over wallet_address; either field may be supplied.

Deprecated: still accepted for backward compatibility, but callers should send user_address — this field carries the user's EOA, which is now accepted as user_address. Either field may be supplied; if both are provided they must match.