Custom destination below you would use with a dial string of: open-door,s,1
[open-door]
exten => s,1,noop(Entering user defined context [open-door] as defined in extensions_custom.conf)
exten => s,n,Set(bar=${CURL(https://url_goes_here.com))
exten => s,n,NoOp(API RESPONSE: ${bar})
exten => s,n,Hangup