How can we create a digital membership card system inside GDevelop games?

Hi everyone, I’m working on a project where I want to implement a digital membership card system inside a GDevelop-based app/game. The idea is to allow users to log in, access their digital membership card, and maybe unlock premium features or events. I came across platforms like Membership Anywhere that provide ready-to-use digital membership cards and cloud-based validation. I’m wondering if anyone here has tried integrating such external membership platforms with GDevelop? Any ideas or guidance on connecting APIs or creating a smooth user experience would be really helpful.

I have indeed, but for something specific (and potentially sensitive) we would have to get deeper in the weeds for that, if you wish.