$Apay has a maximum (locked) supply of 1.000.000.000 (1billion) APAY tokens. 670 million are in circulation (start 2022). The remaining tokens are for marketing, listings, development and team. No more can ever be added, only burned.
Issuer allows any Stellar account to add this asset.
Asset issuer can not freeze the asset in your Stellar account.
These options can not be changed by asset issuer later.