Get ABI

1. Go to https://bscscan.com
2. Enter contract address to search input
3. Navigate to 'Contract' tab
4. Copy ABI in 'Contract ABI' section
5. E.g BEP20: https://bscscan.com/address/0xe9e7cea3dedca5984780bafc599bd69add087d56#code

Generate ABI

1. abigen --abi=[some ABI filename].abi --pkg=[package name] --out=[output.go]
2. E.g: abigen --abi=api/contracts/bep20/bep20.abi --pkg=bep20 --out=api/contracts/bep20/bep20.go

Find the RPC Endpoint

1. Search [Smart chain name] smart chain RPC endpoint
2. E.g: Binance smart chain RPC endpoint => https://bsc-dataseed1.ninicoin.io/

Api example

1. Call contract information: http://127.0.0.1:3000/token/0xe9e7cea3dedca5984780bafc599bd69add087d56
2. Get user balance: http://127.0.0.1:3000/token/0xe9e7cea3dedca5984780bafc599bd69add087d56/balance/0xa0d6d7ee26215d00291d51510040becb9ebb9c4b