More flexible use of transactionReference with Purchase#22

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lukeholder wants to merge 3 commits intothephpleague:masterfrom

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Commits on Feb 19, 2018

AMT and TENDER are already set in parent::getData()
lukeholder
committed
Only use the transactionReference if no card or cardReference is in submitted
lukeholder
committed
Revert "AMT and TENDER are already set in parent::getData()"
lukeholder
committed