Convert json to application/x-www-form-urlencoded

How To
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Problem
I’m trying to create a Stripe payment link for a subscription with multiple line items.
The multiple line items are where I’m getting stuck as I can use the Stripe app’s API call if it was only one line item. I also do not know the total number of line items (1-3 is common, but it could be a lot more)

So far I’ve tried:

  • The built in actions, but Payment links are not available.
  • I’ve tried the API call in the Stripe app, but the request is not mappable.
  • I’m now trying a HTTP request, ideally with aggregated JSON but I’m currently testing with hard coded data (show in the screenshot).

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Question
The main issue is now, compiling the application/x-www-form-urlencoded data. I’ve compiled the JSON, is there a way of converting it?

Or is there a way to compile the data without creating JSON first?