Invoicing - Remove credit card logos from invoice PDF
For businesses that only leverage ACH bank transfers as a form of payment, allow users the ability to remove all credit card logos from the invoice. It's not currently possible to remove the Visa and Mastercard logos from your invoices, when using Stripe as a payment service.

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Hannah Brown commented
Remove the AMEX Logo on the payment screen (not the PDF invoice screen)
You have the option within the settings to remove the AMEX logo from the PDF invoice view screen if you don't offer payments via AMEX through stripe, but when the customer clicks the payment link within the invoice and gets taken to the following screen to fill in their card details and pay the invoice, the AMEX Logo is then displayed here (even though we don't accept it and chose to remove it from the previous screen)
Stripe say its a Xero issue and Xero say not current function to remove it from the payment screen