https://www.zuora.com/developer/API-Reference/#operation/Object_GETProductRatePlanCharge As per the API documentation the Charge Model value for the Discount charge should be as below 1. Discount-Fixed Amount 2. Discount-Percentage However, the promo code validate/consume API call return below values for Charge Model. This is a different format, such as '-' hyphen and blank spaces are removed. I have also attached the entire response with this ticket for review. 1. DiscountFixedAmount 2. DiscountPercentage
The development is working on fix.
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