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Ameliabooking_Helpers::get_coupon_services( int $coupon_id )

	public function get_coupon_services( $coupon_id ) {
		global $wpdb;
		$results = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT name FROM {$wpdb->prefix}amelia_coupons_to_events as coupons
					INNER JOIN {$wpdb->prefix}amelia_services as services 
					ON coupons.eventId = services.id
					WHERE couponId = %d",
				$coupon_id
			),
			ARRAY_A
		);
		return implode( ', ', array_column( $results, 'name' ) );
	}