diff --git a/reference/promotions.v3.yml b/reference/promotions.v3.yml
index e15ea101e..4ffd2d60a 100644
--- a/reference/promotions.v3.yml
+++ b/reference/promotions.v3.yml
@@ -320,6 +320,38 @@ paths:
                   example: 5
                   minimum: 0
                   maximum: 100000
+                prefix:
+                  pattern: '[A-Z0-9_-]'
+                  type: string
+                  description: The fixed text that will appear at the beginning of every generated coupon code. Only capital letters, numbers, underscores and hyphens are allowed.
+                  example: PRE
+                  maxLength: 20
+                suffix:
+                  pattern: '[A-Z0-9_-]'
+                  type: string
+                  description: The fixed text that will appear at the end of every generated coupon code. Only capital letters, numbers, underscores and hyphens are allowed.
+                  example: POST
+                  maxLength: 20
+                delimiter:
+                  pattern: '[_-]'
+                  type: string
+                  description: An optional single character (_ or -) that will be placed between the prefix and the randomly generated code, and again between the randomly generated code and the suffix. It will only be applied if a valid prefix or suffix is present.
+                  example: _
+                  maxLength: 1
+                exclude_characters:
+                  type: array
+                  items:
+                    type: string
+                    pattern: '[A-Z0-9]'
+                  description: An optional array of single length string elements to exclude from the generated coupon codes. Only capital letters and numbers are allowed. The default value is an empty array [].
+                  example: ["1", "2", "3", "4", "5", "A", "B", "C", "D", "E"]
+                  maxLength: 26
+                code_length:
+                  type: integer
+                  description: The length of the random string to be generated for each coupon code. The value must be between 6 and 16. The default length is 16. The total length of each generated coupon code is calculated as `:` code_length + length of prefix with delimiter + length of suffix with delimiter. The maximum total length of a coupon code is 50.
+                  example: 10
+                  minimum: 6
+                  maximum: 16
         required: true
       responses:
         '201':