The Print button is enabled under the following conditions:
- The payment event must have at least one payment that is Frozen and no payments that are Incomplete, Error or Freezable.
 - A processing script is configured in the Point Of Sale (POS) Printer
Integration master configuration. 
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For the Payment Event page, a POS Printing - Payment Event BPA script should be configured.
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For the Payment Event Quick Add page, a POS Printing - Payment Event Quick Add BPA script should be configured.
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For the Payment Quick Add page, a POS Printing - Payment Quick Add BPA script should be configured.
 
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Refer to How To Print Receipts And Endorsements for more information.
