Solutions
PUT {{api-domain}}/crm/v3/Solutions/{{record_id}}/actions/share
Update the sharing permissions of the shared record.
Request Body
{"share"=>[{"user"=>{"id"=>"{{user_id}}"}, "share_related_records"=>true, "permission"=>"read_only"}, {"user"=>{"id"=>"{{user_id}}"}, "share_related_records"=>false, "permission"=>"full_access"}]}