If site uses urn format return 'urn' fieldname for contact as_json()
If site uses urn format return 'urn' fieldname for contact as_json()

rapidpro/casepro,rapidpro/casepro,rapidpro/casepro,praekelt/casepro,xkmato/casepro,praekelt/casepro,xkmato/casepro,praekelt/casepro