Hello,
I am using the plugin with WooCommerce Subscription. For some subscriptions, I have set the first week to be free (0 cost). This generates the following error: “You passed an empty string for ‘payment_method’. We assume empty values are an attempt to unset a parameter; however, ‘payment_method’ cannot be unset. You should remove ‘payment_method’ from your request or supply a non-empty value.”
This happens because, at the time of payment, if the user does not enter card details or enters fake information, the system generates the error but still creates the order in the backend, which immediately fails.
For now, I have temporarily resolved the issue by enabling the old checkout via the “legacy experience” function. With the old checkout, the system does not proceed until the correct credit card information is provided.