Plastiq is unable to process American Express cards outside of certain supported industries.
American Express cards are permitted for the following industries:
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Government
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Utilities
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Education
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Residential Rent
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Club Fees & Memberships
If your payment type is unsupported for American Express cards, other payment methods may still be used, including MasterCard, Visa, and Discover payment cards. For example, here is a small list of categories we cannot support on American Express:
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Mortgages
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Student Loans
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Automobile payments
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Business invoices
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Contractors
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Business Utilities and more
Please note that this list does not include all relevant examples. To review what payment types are supported on AMEX with Plastiq, please reference this chart.