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Offering $0-auth free trials certainly means much lower conversion rates. You will have tons of people tryING to get the free trial with fucked up CCs, no fund prepaids etc. And if you do not put any auth, then you have no idea what is going on with their cards until you try to charge them.
Generally speaking, check with your gateway & PSP. Make sure all configured well (Some providers even rejects $0-auths directly). Make sure scrubbing is not fucking you over and over, and also make sure the traffic quality is clean. An affiliate could be flooding you with no honor cards.
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