Create a standalone voucher. You can choose to create a GIFT_VOUCHER, a DISCOUNT_VOUCHER, or a LOYALTY_CARD. The code path parameter can use all letters of the English alphabet, Arabic numerals and special characters.
When you create a new voucher, you can specify a type to create it.
Creating a new voucher will create a new stand alone voucher if no campaign name or campaign_id is provided. In case of the loyalty card, a campaign name is required.