Hi everyone, i'm stucked on this error, it seems that in Zoho Client Script in Zoho CRM, substring() is not a proper function to use and i need to do a substring (from a string field i just requested) to call an api and get more informations. 

How can i? I tested also if char() or getchar() worked but neither for both and i tested multiple substrings function like subString(), substring(), substr() and nothing seems to work, i always get an error "Uncaught (in promise) TypeError: (intermediate value).subString is not a function"