Integrating APIGEE layer API with APPIAN

I have button click in appian UI which i need to use for consuming API from APIGEE layer.

This is the two APIs we need to integrate

https://it.api-dev.honeywell.com/v1/premiumFreight/appian/validateRequest

for authorization and access token link is

https://it.api-dev.honeywell.com/v2/oauth/accesstoken

And input json i have added in the insert code

I have and API url and access token to pass it to the headers of the api .Can anyone help us to know how to do this integration?

{"row":{
"orderDelNumber":"8105050724",
"orderDelItemNumber":"",
"PO_SO_STO_INDEL_OUTDEL":"OD",
"Source_System":"BID"
}
}

Thanks

Sunu Sam