I have a question about Zoho CRM webhook, and the support can't help me.

I am using webhooks, triggered by workflow rules, to update data from ZOHO CRM ( accounts, leads, ...) in another application. So I have several webhooks to push updates, deletes, creation, ... for several modules.

All of these webhooks are using a specific parameter ( an api token) that is not the ZOHO CRM api token !!!!!  ( I am sorry, but the zoho crm support on the live chat is not able to understand that,  ..... ). In all my webhooks, I have a parameter called token, with the same value (of course).

My problem is that sometimes, this token is refreshed by the external api. So I have to edit all my webhooks, and manually change the value of my parameter. 

My question : can I use Zoho CRM variable, to store the value of my parameter once, and the call the variable in the Wehhooks parameters, so that  when the external token changes, I just have to change the value of the global CRM variable, and not the value written in each wehbook ?