Short answer
Check the currency on the PaymentIntent against the payment method attached to it. Create the payment in a currency that method supports, or collect a payment method that supports the currency you charge in. Stripe’s payment method support table lists the currencies for each method.
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Why the currencies don’t match, and the fix
01
The payment is in a currency the method doesn’t support
“A payment can only be created for the same currency as the corresponding payment method.” Stripe, Error codes (payment_method_currency_mismatch)
A single-currency method such as a bank debit can’t pay in another currency. Charge in the method’s currency, or ask the customer for a method that works in yours.
02
Single-currency methods
“Payment methods support certain currencies, countries, products, and API options.” Stripe, Payment method support
Check the method against Stripe’s support table before offering it. SEPA Debit and iDEAL take EUR, ACH Direct Debit takes USD, Bacs Direct Debit takes GBP, BECS direct debit takes AUD, and Boleto takes BRL. Cards take most currencies.
03
Multi-currency pricing picked the wrong currency
Also check: code that sets the currency from the visitor’s location or a price list while reusing a single-currency payment method, such as a SEPA or ACH debit, that can’t pay in the new currency.
Checked against the vendor’s docs on : Stripe docs: Error codes; Stripe docs: Payment method support.
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Related: Stripe currency not supported · Stripe payment_method_unactivated · Stripe “No such PaymentMethod” · Stripe invoice_no_payment_method_types