Unfortunately, this forum is for ideas on how we can help improve our documentation and merchant integration services and features. I've asked our teams internally and they've stated that we do not automatically strip the comma out of the amount string and that it would be an enhancement that Quickbooks would have to make on their end.
If you'd like to ask the broader community, please post this question in the PayPal Payments Standard - Merchant Integration Technical Support
Thanks - Christina
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