Webhook data limits

Hi, there is any plan to increase the webhook data limits over 255 bytes ?. I’m working with OAuth2 to access Calendar API in Office 365 Exchange and the authorization tokens involved in the Rest API exceed significantly 255 bytes, it’s up to near 2K bytes. So, there is no way to go ahead with webhook for this purpose. So, again, any plans to increase this ? or somebody could suggest other strategy. Direct https request connections seems to be hard to handle for this purpose.

thanks in advance,