BDK Native plugin question

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Hi, all. Thank you in advance for your time.

I’m trying to use the BDK Native plugin for iOS and Android in-app purchases–subscriptions, specifically. The documentation isn’t helpful on this, so if anyone could help me out, I’d greatly appreciate it.

Here’s what I’m trying to figure out: I’m using the “verify receipt” and “read receipt” actions to check subscription status, as this is the only apparent way with this plugin. In the photo I uploaded, you can see there’s a field simply labelled “receipt,” and I’m wondering what needs to go there when I’m simply trying to make a call to Apple’s servers in order to find the user’s current subscription expiration date. The current user’s subscription ID?

Thanks again!