Zoho subscription webhook adding an extra & after url parameters

Zoho subscription webhook adding an extra & after url parameters

Webhook url to which subscription update is being posted is 
http://Saurav.insync.pro?agdid=ezi7BpsBsEy0D-vYohMwFQ&
However, in the configuration section of the webhook, only one key value pair is added in the url parameter section.
This can be found in the webhook log.