recurring is true.prepaid is true. The default value for prepaid is false.productSpecType product.productSpecType coupon.productSpecType issue. In order to understand which fields are required, we need to know that a periodical magazine is a subscription product and a subscription product (productSpecType coupon) has a coupon number. The coupon number should be defined in productSpecCodeand productSpecNo fields. In order to identify the single copy of the subscription product, you need to set the issue code in productfield.