Feature Additions 4.x, 5.x, and 6.x Schema
4.x
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Level III Data Support - added support for the submission of Level III data in transactions.
5.x
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PayPal Support (5.1) - added support for PayPal transactions
6.x
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Schema Reorganization (6.0) - reorganization of the schema files to enforce element ordering (sequence of elements).
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Bill Me Later Support (6.1) - added support for BML transactions.
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Auth Reversal Transaction (6.2) - added support for Authorization Reversal transactions.