Bep20 CLAIM contract

I want to make a contract like it. I think it’s very convenient, but I don’t know how it’s formed. When people request to submit an address, it will be automatically dropped into people’s accounts

try web:

Web3 I have a general understanding of the block principle, have learned source code or ideas?

I found its contract address: 0xa202bcf4afe788232d83c18f4d46f30f2c4e67be

Uploading: 截屏2021-05-25 下午8.19.18.png…

I tried to copy the source code to run on the contract, but it went wrong