I use Shift4 as taxi driver and have no issues whatsoever. Zamir Afzal is always available if I need him but to be fair since switching to Shift4 I've not really had issues. Would highly recommend to anyone thinking of joining.
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Shift4 (NYSE: FOUR) is boldly redefining commerce by simplifying complex payments ecosystems across the world. As the leader in commerce-enabling technology, Shift4 powers billions of transactions annually for hundreds of thousands of businesses in virtually every industry.