Comment by durpkingOP

Yes this is a proxy tokenizer. This is from the KillBill FAQ: Don’t store sensitive data in Kill Bill. While most plugins have support for directly saving card or bank account numbers for instance, this should only be used for testing purposes or if you use a proxy tokenizer: if you don’t, use a third-party vault. Encrypt username and passwords in configuration files. https://killbill.io/faqs/