ERC1155 Certificate for 01k Academy

Task: Make non-transferable NFT certificates for academic students.Implementation: After consultation, the decision was made to implement certificates on the basis of the ERC1155 contract in the Polygon network.I made a contract taking into account all the wishes of the customer, set a WL mint so that the certificate could only be obtained by students who successfully passed the course, uploaded a service contract that allows you to easily and without interference in the code to add new addresses to Whitelist and broke a simple landing-page on which the user can connect his crypto wallet and finish NFT.The collection page was also set on Opensea.Collections on Opensea: https://opensea.io/collection/a01k-academy

Note: NFTs are untransmitted, while they can be displayed on Opensea, but when trying to buy them there will be a mistake.This is the feature of Opensea, because they do not prohibit the exhibition of non-transferable tokens for sale, but there is no sense in this.The certificate itself is 1 per wallet, and the money for the wallet is sent to the customer's wallet.There is also the possibility to add other certificates to the collection.