How to hold back KYC reward until the end of the ICO Crowdsale

Question

I have created a token and Crowdsale Contract in the Etherum Network. I have a question regarding KYC rewards.

If someone sends ETH to my crowdsale contract i know how to return my own coin as a reward but how do i hold back the reward until the end of the ICO? I want to send the reward only after the user has filled information on my webpage for KYC.

Answer 1

Your contract contains two functions - the payable function which is called by your user, and an admin-only function called by your site called authorize. When a user will complete the KYC tasks on your site, the authorize function is called from your admin address with the user's address. This address is added to a map in the contract. And when the user calls the payable function, the function verifies the user's address is contained in the map, then issues tokens accordingly. If the user's address is not in the map, i.e. they have not been authorized by an admin, the function fails.