Payment links make it easy to take payments. Where you’re going to need to some custom work is if you actually want your Ghost site to know about the payment – i.e. to put a member on a paid tier. There, you’d want to look at their webhooks (Webhooks | Introduction to the Mollie API | Mollie Documentation). You’d need a server or cloud function (not native Ghost) to listen for those webhooks and then talk to the Ghost Admin API to get the member created or upgraded.
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