This API is used to Open New Ticket Using Service Catalog.
Please check example usage of Vision Helpdesk API

Operation : open_new_ticket
Module : ticket

$postfields["vis_module"] = "ticket";

$postfields["vis_operation"] = "open_new_ticket";
// This is the domain id under which you wish to open ticket

$postfields["vis_domain"] = 1;
// This is the department id under which you wish to open ticket

$postfields["vis_department"] = 1;
// This is the department id

$postfields["vis_email"] = "test1.vhd@gmail.com";
// valid client email address

$postfields["vis_service_category"] = 1;
// This is the service category using that you wish to open ticket

$postfields["vis_service_item_id"] = 1;
// This is the service item id

$postfields["vis_channel"] = 1;
// This is the channel id

$postfields["vis_service_cost"] = 100;
// This is the service cost

$postfields["vis_subject"] = "Service Request Ticket subject";
// Ticket subject

$postfields["vis_ticket_post"] = test;
// This is the ticket post data

$postfields["vis_from"] = "support@visiononlinedemo.com";
// This is the from email address that will be displayed in from column

$postfields["vis_status"] = 1;
// This is the status id

$postfields["vis_type"] = 1;
// This is the ticket type id under which you wish to open ticket

$postfields["vis_priority"] = 1;
// This is the ticket priority id

$postfields["vis_from_email"] = "test@gmail.com";
// valid mailqueue email address

$postfields["vis_sendmail"] = 0;
// 1 = send email and 0 = don’t send email to client

$postfields["vis_as_client"] = 1;
// 0 = create as staff reply and 1 = create ticket on behalf of client

$postfields["vis_send_message"] = 1;
// 1 = send autoresponder and 0 = don't send auto responder client

$postfields["vis_service_email"] = "test_service@gmail.com";
// valid service email address

$postfields["vis_service_quantity"] = 1;
// This is service quantity

Below is API URL example for Open New Ticket using Service Catelog

http://visiononlinedemo.com/support/api/index.php? &vis_txtusername=admin &vis_txtuserpass=21232f297a57a5a743894a0e4a801fc3 &vis_module=ticket &vis_operation=open_new_ticket &vis_domain=1 &vis_department=1 &vis_email=test1.vhd@gmail.com &vis_service_category=1 &vis_service_item_id=1 &vis_channel=1 &vis_service_cost=100 &vis_subject=Service+Request+Ticket+subject &vis_ticket_post=test &vis_from=support@visiononlinedemo.com &vis_status=1 &vis_type=1 &vis_priority=1 &vis_from_email=test@gmail.com &vis_sendmail=1 &vis_as_client=1 &vis_send_message=1 &vis_service_email=test_service@gmail.com &vis_service_quantity=1 

Or use "access token" to Open New Ticket using Service Catelog

http://visiononlinedemo.com/support/api/index.php? &vis_txttoken=T0RSbU56TmpZemxoTlRabU1XWTJOV1ZtT0RWa1ltUm1NR1F6WldJell6VT0= &vis_module=ticket &vis_operation=open_new_ticket &vis_domain=1 &vis_department=1 &vis_email=test1.vhd@gmail.com &vis_service_category=1 &vis_service_item_id=1 &vis_channel=1 &vis_service_cost=100 &vis_subject=Service+Request+Ticket+subject &vis_ticket_post=test &vis_from=support@visiononlinedemo.com &vis_status=1 &vis_type=1 &vis_priority=1 &vis_from_email=test@gmail.com &vis_sendmail=1 &vis_as_client=1 &vis_send_message=1 &vis_service_email=test_service@gmail.com &vis_service_quantity=1