Payment Plugin: Cashu

1. Configure "CashU" payment plugin at aMember CP->Setup->CashU (this page) Set EXACTLY the same Encryption Keyword in aMember CP setup and CashU Merchants CP.
2. Inside the CashU merchant account using the tab "Encryption Information" set "Return URL" to https://example.com/amember/payment/cashu/thanks
3. Try your integration - go to aMember signup page, and try to make new signup.