Gumroad integration

[est3ban129]

Can anyone tell me how much it will cost to make a plugin to manage subscription payments through GUMROAD?
If the user pays a subscription it will be placed in a user group.
When the expiration date of the subscription arrives, it will be moved to the common group of registered users.
If the subscription is automatically renewed, the xenforo user will be kept in the vip group

API INFO: https://app.gumroad.com/api#subscribers

Thanks


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