To work with Bitcoin you need to register on Chainstack and create the necessary node for provide services. To turn on Bitcoin make the following changes in the configuration file:
# global/config.yaml ... paymentInterfaces: enabled: true ... bitcoin: id: "BITCOIN-PI" enabled: true ... # To change the Bitcoin logo or resize, use logo_url logo_url: "https://raw.githubusercontent.com/nsart/coin-logos/master/btc.png" ...