Request body should contain ref_id

If a matching record is not found, the update request would generate a 400-Bad Request.

API will convert prospective lead to active lead with updated data

The update request should contain at least one of the following fields. System will try to update all the fields passed in the request

phone: will be appended to existing phone numbers (if not already exists in the lead)
email: will be appended to existing emails (if not already exists in the lead)
owner: will modify the current owner (Sales Person) of the lead
lead_status: Should be valid lead status slug
disposition: Lead Disposition
src_detail: Src detail
src_alias: Src alias
utm_src: UTM source
utm_medium: UTM medium
utm_campaign: UTM campaign
utm_keyw: UTM keyword
dialer_id: Dialer ID