Webhook to parse Activity Details values

[Geoff_Krajeski1]

Is it possible to write a webhook that can parse a query parameter value and add it to a particular Marketo field, and what would it look like?

I have yet to write one myself.

Example scenario:

e=myemail@my.com&id=1234

Parse id and change data value of "Legacy Client ID" field

[Josh_Hill13]

Rajesh Talele and Hoosh have some webhook options.

[Geoff_Krajeski1]

Rajesh Talele , do you have any suggestion here?  This is an urgent and one-time need as I inherited some bad data.

Trying to not have to go into thousands of records