IPaymentConnector 
    Functions
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                  If payment confirmation is required during a Sale, this method accepts the payment
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                  If signature is captured during a Sale, this method accepts the signature as entered
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                  add an IDeviceConnectorListener to receive callbacks
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                  Auth method to obtain an Auth payment that can be used as the payment to call tipAdjust
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                  Capture a previous Auth.
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                  Used to request a closeout for open transactions.
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                  Initialize the connector's connection.
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                  Manual refund method, aka "naked credit"
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                  PreAuth method to obtain a Pre-Auth for a card
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                  PreAuth method to obtain a Pre-Auth for a card, with high availability.
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                  Used to request card information.
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                  Refund a specific payment
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                  If payment confirmation is required during a Sale, this method rejects the payment
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                  If signature is captured during a Sale, this method rejects the signature as entered
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                  remove an IDeviceConnectorListener from receiving callbacks
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                  Used to reset the device if it gets in an invalid state from POS perspective.
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                  Sends a request to get a payment.
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                  Used to request a list of pending payments that have been taken offline, but haven't processed yet.
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                  Sale method, aka "purchase"
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                  Send device logs
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                  Sets configuration (e.g.
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                  Adjust the tip for a previous Auth.
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                  Vault card information.
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                  Void a transaction, given a previously used order ID and/or payment ID
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                  Sends a request to void payment refund.