php call rest api [ xml / post method]

I need you to review the api document and call the api from the sample code you only need to make a sample document for ONLY ONE API rest will be a different task. .............. Dear Team, Greetings from Avenues!! Please find the attached details for Bill Avenue Integration. Your account has been created in our UAT environment, please find the below details for your reference. Agent Institution ID xx Agent Institution Name xxx Access Code xxx Working Key xx We request you to let us know the IP address from where you will make the API calls, so that the same could be whitelisted at our end. It is mandatory to pass all the below given parameters to us in the request in POST format. 1. accessCode 2. requestId (Alphanumeric 35 characters unique ID for each request) 3. encRequest (Encrypted XML Request) 4. ver (Fixed version value 1.0) 5. instituteid Encryption/working key is used for the encrypting the data sent in encRequest. For INIT channel "INT", kindly refer the file "[login to view URL]" For App INIT channel will be " MOB" (Cash Mode will not be supported) , Kindly refer file "Mob Updated Sample [login to view URL]" Please Note your front-end should be as per BBPS standard (ReferFile:“[login to view URL]”). Please find attached "HPCL LPG biller Enablement [login to view URL]" for HPCL biler. Please find attached "DMT API Doc.1.0" for DMT