Added a 'if' condition so that it works both Old and New Clickatell accounts.
Edited line Numbers -> 262 and (480-494)
This works for both Old and New Clickatell Users, provided
->Old Clickatell users use "https://api.clickatell.com/" in CiviCRM SMS provider Settings
->New Clickatell users use "https://Platform.clickatell.com/" in CiviCRM SMS provider Settings
-Used If-Else Conditional Construct.
-Placed URL for old credentials in if construct and URL for new credentials in else construct.
-Now $responseData is fired only once
Added a 'if' condition so that it works both Old and New Clickatell accounts.