This article also answers:

  • Does V2 portal support adding multiple coupons for a subscription?
  • Can I disable the option for customers to add multiple coupons to a subscription?

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Customers can apply multiple coupons from Customer Portal (only V1) if you have enabled the "Allow multiple coupons" option under Settings >> Customer-facing essentials >> Checkout & Self-Serve Portal >> Customer Portal >> Allowed actions


Here's a screenshot.


Note that only two coupons can be applied to a subscription, with each coupon having different Discount Types (Eg: Fixed Amount & Percentage). Here's more information on applying multiple coupons to a subscription. 


Currently, there is no option for customers to add multiple coupons in the V2 portal. It will be supported in the upcoming releases.