Unfortunately there is no support for ERC-20 at the moment. This is something that I hope to address later in 2021, after the release of wallets 6.0.0, which should be somewhere in Q2 of 2021.
Moreover, the plugin is not appropriate for token sales, only for creating exchange markets.
P.S. I am moving this thread to the General discussion because it’s not relevant to the CoinPayments adapter. The CoinPayments adapter uses some ERC-20 tokens indirectly, but only those supported by the CoinPayments platform.