Square USA (and Square Canada) is a payment gateway that allows you to accept credit card transactions within your site.
This gateway supports the following features:
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Authorize
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Capture
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Purchase
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Refund
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Void
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Recurring payment
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Tokenization
The following fields are required:
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Access token
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Application ID
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Location ID
To save user payments, you must make sure to enable Authenticate identity (3D Secure) and Tokenize data under Configuration > Payments under the Credit/Debit card section.