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The ap didn't do what I needed it to do and was unclear, even after talking to assistants.

There is no way to cancel this ap on shopify, no cancel button.
I contacted them to cancel it, they said they would not charge me.

They have charged me. I am now trying to get a refund.

If you had a CANCEL PAYMENT button, you would not be getting a 1 star review.

This is the 3rd time I am trying to stop this ap.

Just taking peoples money, with no way to cancel it, is really bad practice.
I will be reporting this to my bank fraud team.