im also getting this error, using the paypal module in odoo CE V12, and the sandbox accounts from paypal, i have it the facilitator configured in odoo paypal module, with id token, etc., but when i try to purchase something the page shows always "Things don't appear to be working at the moment. Please try again later." and the flowlogging_id=6597d28ec166c code=ERROR mfid=1565036432066_6597d28ec166c I configure step by step using the guide, but i get always this error, i have my site as https and
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