Add commission referral

Adds commission-referral details to the specified sale. Returns 422 if referral type is unknown, required referral type is missing, percent and amount are both set, values are out of range (percent 0-100; amount >= 0), brokerName exceeds 50 characters, or contact fields are invalid (first/last name required when contact is provided, email format/length, phone must be 10 digits).

Validation & Requirements

Required Parameters

• saleGuid (path, string, format=guid)
• form (body, object)

Required JSON Body Fields

• None

Validations

• Invalid GUID values in *Guid/*Guids fields return 422 Unprocessable Entity.
• Invalid date values in *date* fields return 422 Unprocessable Entity.
• Missing required request body returns 422 Unprocessable Entity with Missing request body..
• Additional business-rule validation may return 422 with details in the errors array.
• Commission referral values must satisfy domain commission rules; invalid percentages/amounts return 422.

Integration Requirement

• Retrieve the corresponding ...Form endpoint immediately before write operations to get current dynamic required fields and allowed values.