Some people seem to be confusing scrubbing with shaving.
Shaving is when a sponsor doesn't give you credit for all of the sales you've sent to them.
Scrubbing is what the credit card processors do to control fraud. The harder they scrub, the more legitimate sales get declined.
This is necessary to keep all the sites under the 1% chargeback ratio allowed by visa.
I see the same thing with epoch. I'll maintain a consistent ratio for awhile and then for no reason at all my ratio will triple for a few days, and then go back to normal.
Other than getting your own merchant account for your sites there's nothing you can do about it.
(Except bang your head against the wall, which I frequently do)
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