Add Webhook with several parameters to function in Zoho CRM

Add Webhook with several parameters to function in Zoho CRM

Hello, 

I was trying to send a webhook with several parameters within a function in Zoho CRM (via Workflow rule). I tried to do this with this code, but it returns an error: 
Error due to - 'Internal Exception' Line Number:5


  1. urlData = "https://hooks.zapier.com/hooks/catch/XXXXXXXXXX";
  2. webhookparams = Map(); 
  3. webhookparams.put("subscrid", Subscription_ID);
    webhookparams.put("subscrnumb", Subscription_Number);
    webhookparams.put("contactbilling", Billing_Contact);
    webhookparams.put("contactshipping", Shipping_Contact); 

  5. resp = invokeUrl("urlData", "POST", webhookparams);
  6. info resp;

How can I solve this?

Thanks for help, 
Michael