PROMO-1257: Added optional delimiter field for bulk coupon api /v3/promotions/{promotion id}/codegen

Author: bc-anshumishra

reference/promotions.v3.yml

@@ -332,6 +332,12 @@ paths:
                   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
                 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` + length of `suffix`. The maximum total length of a coupon code is 50.'