Edit: Nvm, they don't tokenize with the data. How did I miss that...
The first place I saw this code pattern was of course at Stripe, but I would be happy to learn that it predates them.
I also have a little service that attaches to web forms and does interesting things with the data in a similar way. It also scrapes the form at submission time just like Stripe and Braintree do. Nothing malicious in case you were thinking it.
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Edit: Nvm, they don't tokenize with the data. How did I miss that...
The first place I saw this code pattern was of course at Stripe, but I would be happy to learn that it predates them.
I also have a little service that attaches to web forms and does interesting things with the data in a similar way. It also scrapes the form at submission time just like Stripe and Braintree do. Nothing malicious in case you were thinking it.