To work with Ethereum you need node. You can create your own node or register on services that provide access to node. For example Chainstack. After registration you need to choose network: Ethereum Goerli Testnet, Ethereum Sepolia Testnet etc.
To turn on Ethereum make the following changes in the configuration file:
# global/config.yaml
...
# enabled paymentInterfaces - true
paymentInterfaces:
enabled: true
...
# select currency name
evm:
# select currency id and turn on it
- id: ETHEREUM-PI
enabled: true
...
# enter the nodes url if use Chainstack
url: "https://nd-900-465-297.p2pify.com/86cbca1a70193ee4942de1810b68dba2"
...