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Square Payment Form Integration

I have a client wanting to switch from Square Checkout API to the Square Payment Form so he can save credit cards on file. The Squareup documentation requires javascript. I saw on another thread this may be possible via a plugin.

Can anyone confirm if this can be done via plugin. Here is the square documentation: https://developer.squareup.com/docs/payment-form/payment-form-walkthrough

I have never built a plugin and also wondering how difficult it will be.