HTTP pulling through all data

[Rob_Kraushar]

Hi all, I am new to the tech world and am creating a workflow from retell AI→cal.com→make.com. I have a booking made by cal.com in a google calendar which has a customer phone number in the invite description. I think I have isolated the number in make.com using the text parser and set variable but when I try and use a HTTP to GET the booking it pulls through all calendar invites and not ones related to a specific phone number. Have attached some screenshots below of the Set variable and HTTP output along with my HTTP fields. Anyone have any ideas on how to resolve this? Let me know if more info is needed