PayFast test payment

I am having issues making PayFast (test) payments:

• WordPress 4.8 running Supreme Directory theme.
• Payments V2.0.2. plugin
• PayFast Payment V1.0.0

I have the Payfast payment option and PayFast test mode enabled.

In the checkout section of the website, I see an error that states “NO payment gateway configured”; and on PayFast gateway, I am alerted that:

1. The merchant key is invalid
2. After clicking “Cancel”, there is no return URL configured

I have checked both these settings (PayFast account and Invoicing admin side) and the values are correct – I did not change the ITN URL, as per plugin instruction.

On which side is the error?

Is it a problem that I am using the test gateway?

Furthermore (might be a topic for a different ticket) the payments plugin states that PayPal is the only recurring payment option – this is not possible via standard integration (in my country, to the best of my knowledge) … however, PayFast offers recurring payments too; has the documentation/plugin messaging not been updated yet or is there really no way of accepting recurring payments via PayFast?

WooCommerce does a very simple and nice business integration for accepting PayPal payments (including credit card) – the GD Payments integration seems rather manual/cumbersome by comparison.

Please advise/assist.