Security Guide 3.2.9 Managing the Secure External Password Store for Password Credentials uses the mkstore utility to create database credentials: mkstore -createCredential.
However, another section of the book says that the utility is deprecated. B.1.3 Tools Used to Manage Oracle Database Wallets and Certificates:
mkstore is a command-line Oracle utility that you can use to add secrets to the wallet and then manage them. It is available in the Oracle Database client. Starting in Oracle Database release 23c, mkstore is deprecated. Oracle recommends that you use the orapki instead of mkstore.
How to manage the Secure External Password Store using the orapki tool?