The category associated with the referral code.

A custom pattern for the referral code, with a length between 6 and 32 characters. The pattern follows specific character representations:

• L = Lowercase letter (a-z)

• U = Uppercase letter (A-Z)

• D = Digit (0-9)

• X = Uppercase letter or digit (A-Z, 0-9)

• S = Special character (!@#$%^&* etc.)

• M = Mixed (any of the above) Example patterns:

• XXXX-DDDD → A1B2-C345

• LLUU-SS → abCD-!@