Payment Plugin: FastSpring Contextual
Configure plugin at aMember CP -> Configuration -> Setup/Configuration -> FastSpring Contextual Commerce
Configure FastSpring Product Path at aMember CP -> Product -> Manage Products (Billing Plans)
Configure Webhook URL in your FastSpring account (Integrations -> Webhooks)
URL: https://example.com/amember/payment/fastspring-contextual/ipn Events: order.completed return.created subscription.activated subscription.canceled subscription.charge.completed
Enable "Enable webhook expansion" setting. That is necessary if you want to use Create order on demand.
Run a test transaction to ensure everything is working correctly.
Note: You can setup in FastSpring the same coupon code as in aMember.