Are there any cases where the Android SDK PaymentConnector's sale(), void() or refund() methods don't return a callback response? If so, what would be the best way to get the status of those particular transactions?
Do methods in PaymentConnector always return a callback response?
Is it possible for the device to disconnect from the clover gateway?
Yes, of course. If the device loses its internet connection for example. You may want to take a look at this -https://community.clover.com/questions/25699/recovery-on-transaction-failures-using-clover-sdk.html.
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