_order_map = $new_mappings;
		} else {
			// If we are dealing with ONLY offline PMs updates (for all that are registered) and their group is present,
			// normalize the new order map to keep behavior as intended (i.e., reorder only inside the offline PMs list).
			$offline_pms = $this->get_offline_payment_methods_gateways();
			// Make it a list keyed by the payment gateway ID.
			$offline_pms = array_combine(
				array_map(
					fn( $gateway ) => $gateway->id,
					$offline_pms
				),
				$offline_pms
			);
			if (
				isset( $base_map[ self::OFFLINE_METHODS_ORDERING_GROUP ] ) &&
				count( $new_mappings ) === count( $offline_pms ) &&
				empty( array_diff( array_keys( $new_mappings ), array_keys( $offline_pms ) ) )
			) {

				$new_mappings = Utils::order_map_change_min_order( $new_mappings, $base_map[ self::OFFLINE_METHODS_ORDERING_GROUP ] + 1 );
			}

			$new_order_map = Utils::order_map_apply_mappings( $base_map, $new_mappings );
		}

		return Utils::order_map_normalize( $new_order_map );
	}

	/**
	 * Group payment gateways by their plugin extension filename.
	 *
	 * @param WC_Payment_Gateway[] $gateways     The list of payment gateway instances to group.
	 * @param string               $country_code Optional. The country code for which the gateways are being generated.
	 *                                           This should be an ISO 3166-1 alpha-2 country code.
	 *
	 * @return array The grouped payment gateway instances, keyed by the plugin file.
	 *               Each group contains an array of payment gateway instances that belong to the same plugin.
	 *               If a payment gateway does not have a corresponding plugin file,
	 *               it will be grouped under the 'unknown_extension' key.
	 */
	private function group_gateways_by_extension( array $gateways, string $country_code = '' ): array {
		$grouped = array(
			// This is the group for gateways that we don't know how to group by extension.
			// It can be used for gateways that are not registered by a WP plugin.
			'unknown_extension' => array(),
		);

		foreach ( $gateways as $gateway ) {
			// Get the payment gateway details, but use a dummy gateway order since it is inconsequential here.
			$gateway_details = $this->get_payment_gateway_details( $gateway, 0, $country_code );
			// If we don't have the necessary plugin details, put it in the unknown group.
			if ( empty( $gateway_details ) || ! isset( $gateway_details['plugin'] ) || empty( $gateway_details['plugin']['file'] ) ) {
				$grouped['unknown_extension'][] = $gateway;
				continue;
			}

			if ( empty( $grouped[ $gateway_details['plugin']['file'] ] ) ) {
				$grouped[ $gateway_details['plugin']['file'] ] = array();
			}

			$grouped[ $gateway_details['plugin']['file'] ][] = $gateway;
		}

		return $grouped;
	}
}