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Problem:
The client is experiencing issues with assigning specific currencies to their default payment gateway, and the settings indicate that this payment gateway is not supported. Additionally, configuring a specific country for this payment method in the gateway settings does not work.
Solution:
If you're experiencing issues with unsupported payment gateways in WPML, we recommend using custom code to manage their availability based on the selected currency. You can utilize the

filter to add or remove gateways depending on the active currency. For guidance on implementing this, please refer to a related discussion in our forum: https://wpml.org/forums/topic/assign-payment-method-to-a-specific-currency/
Alternatively, if you are looking to use Stripe with multi-currency, installing the WooCommerce Gateway Stripe plugin might resolve the issue. You can find the plugin here: https://wordpress.org/plugins/woocommerce-gateway-stripe/
If these solutions do not apply to your case, or if they seem outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If further assistance is needed, please open a new support ticket at WPML support forum.