Same issue! I've run in to this with two differnt clients in the last two weeks even though I have signed contracts on them and now go he extra step of having the AmEx clients call their card to anticipate the PayPal Here charge. I called American Express Merchant Services and they say that the issue is with PayPal's master merchant account number. I called PayPal to tell them that someone from their side needs to talk to someone on American Express' side and they said that I was making it up, that there was no such issue, and that if there was then American Express would call them. Infuriating! There's a problem and this needs escalation but the customer service people at PayPal are so arrogant that they won't listen and actually fix it.
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