Adds a document to a sale. fileName and base64Content are required. Returns 422 for invalid file names, file names longer than 150 characters, or invalid base64 content.

Validation & Requirements

Required Parameters

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

Required JSON Body Fields

• base64Content (minLength=1)
• fileName (minLength=1)

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.
• File name is required and cannot exceed 150 characters.
• base64Content must be valid base64.

Integration Requirement

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