Use Stripe "Link within card" integration instead of "Link as a payment method"

fkwcs_link_with_card.php

/**
 * "Link within card" for the main Card gateway only.
 * Leaves the standalone Link gateway and the express button untouched.
 */
add_filter( 'fkwcs_stripe_payment_element_data', function ( $config, $gateway ) {
      if ( ! is_object( $gateway ) || 'fkwcs_stripe' !== $gateway->id ) {
              return $config; // don't touch Link gateway / others
      }

      // Drop 'link' so the payment saves as a card-type PaymentMethod (keeps brand/last4).
      if ( ! empty( $config['element_data']['payment_method_types'] ) && is_array( $config['element_data']['payment_method_types'] ) ) {
              $config['element_data']['payment_method_types'] = array_values( array_filter(
                      $config['element_data']['payment_method_types'],
                      static function ( $type ) { return 'link' !== $type; }
              ) );
      }

      // Keep Link visible inside the card form a wallet is the display gate, not payme
      if ( empty( $config['element_options']['wallets'] ) || ! is_array( $config['element_options']['wallets'] ) ) {
              $config['element_options']['wallets'] = array();
      }
      $config['element_options']['wallets']['link'] = 'auto';

      return $config;
}, 20, 2 );