def cred_def_id(issuer_did: str, schema_seq_no: int) -> str:
return '<STR_LIT>'.format(issuer_did, schema_seq_no, CD_ID_TAG)<EOL>
Return credential definition identifier for input issuer DID and schema sequence number.

:param issuer_did: DID of credential definition issuer
:param schema_seq_no: schema sequence number
:return: credential definition identifier