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That is interesting, the form is a POST, must be Javascript doing the GET in its place. I wonder what the technical advantage of GET is in this case.

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The technical advantage is getting around the same-origin policy by using JSONP (which by its nature can only be used with GET requests for the script).

Maybe has something to do with this: https://stripe.com/blog/stripejs-and-jsonp (they mention JSONP only supporting GET requests)?

Yup. Duh.

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