This bridge is two layer bridge. In the base level the Arbitrary Message Bridge (AMB) is responsible for relaying messages between the networks. On top of the AMB, the pluggable mediators implement a contract logic of token relaying of various assets. More info https://docs.tokenbridge.net/amb-bridge/about-amb-bridge
The contract is called an "inverse-native" bridge, because the home and foreign network are inversed. In that case Fuse network is foreign and BSC is the home network.
Home side of the bridge on the BSC network: 0x51849F05090b222FFc329DC8825de0D7e26F84A1
Foreign side of the bridge on the Fuse network: 0xA3C59198c10cB1ba9A3Ab924A23253072b393f25
BNB token on the Fuse network: 0x6acb34b1Df86E254b544189Ec32Cf737e2482058
Home side of the AMB bridge on the BSC network: 0x3A5A320a2f98a3Fe39c9040e7e3E9caA7F0D5bd6
Foreign side of the AMB bridge on the Fuse network: 0x1ee6E3E3d2DE779858728E157B3B9C488bA7b706
To send token from the BSC network:
Send native BNB token to the home bridge contract. Then you receive an equal amount of the BNB token on the Fuse network, sent from the foreign bridge contract.
To send token from the Fuse network:
Approve the "BNB on Fuse" ERC20 token to be spent by the Foreign bridge.
Call relayTokens function on the bridge contract
relayTokens method will lock the ERC20 tokens on the foreign bridge. After a couple of confirmations, an equal amount of the BNB native token will be released from the home bridge contract on BSC.