How to limit the list of shown and accepted through the Braintree payment gateway bank card types for a particular customer's country?

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«Stores» → «Configuration» → «Sales» → «Payment Methods» → «BraintreeTwo» (or «Braintree») → «Country Specific Settings» → «Country Specific Credit Card Types»:

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See also:

• The collectTypes() method from the Magento_Braintree's cc-form.js can be simplified from 8 lines to 1
• The collectTypes() method from the Magento_BraintreeTwo's validator.js can be simplified from 8 lines to 1
• The collectTypes() method is duplicated in the Magento_Braintree's cc-form.js and Magento_BraintreeTwo's validator.js