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Single-Message Processing {#payments-intro-processing-sales-single}
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Single-message processing treats the authorization and capture as a single transaction. There are important differences between dual-message processing and single-message processing:

* Single-message processing treats the request as a full-financial transaction, and with a successful transaction, funds are immediately transferred from the customer account to the merchant account.
* Authorization and capture amounts must be the same.
* Some features cannot be used with single-message processing.  
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