Payment Plugin: TouchNet uPay

The "Require encoded validation key for amount?" field on the uPay Payment Settings page must be set to Yes.

You must enter a "Passed Amount Validation Key" value on the uPay Payment Settings page. And the same value for validation key in amember.

You must configure your uPay site to use a posting URL: https://example.com/amember/payment/touchnet-upay/ipn