I need help creating an endpoint that can receive json data - php

Question

I have created a php file that sends json data to an external url. Their API requires that I have a page on my website that receives the json responses for processing. The one that sends json data works well. I need help with the second php page that should process it
$Url="http://example.com/submit.php";
$date = date_create();
$UserID=7;
$Password='';//<-password written here
$Timestamp=date_timestamp_get($date);
$token=$UserID.$Password.$Timestamp;
$data_string = array();
$data_string = array(
"AuthDetails" => array(
array(
"UserID" => $UserID,
"Token" => md5($token),
"Timestamp"=>$Timestamp
)
),
"MessageType"=> array(
"3"
),
"BatchType"=>array(
"0"
),
"SourceAddr"=>array(
"Example"
),
"MessagePayload"=> array(
array(
"Text" => "Sample text message by Example :)"
)
),
"DestinationAddr" => array(
array(
'MSISDN'=>'254701000000',
'LinkID'=>''
)
),
"DeliveryRequest" => array(
array(
'EndPoint'=>'',//<-URL that receives the response
'Correlator'=>md5(uniqid())
)
)
);
$data_string=json_encode($data_string);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $Url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data_string),
)
);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 20);
$output = curl_exec($ch);
if(curl_errno($ch)){
echo 'Request Error:' . curl_error($ch);
}
curl_close($ch);
return $output;

Answer 1

Ok this is going to be a bit generic but it should put you on the right path.
So you have to write a script that will process the response from them i.e. your end-point for this circle of events.
So lets call it my-enpoint.php
So in the message you send to them you put the address of this new script into this parameter
"DeliveryRequest" => array(
array(
'EndPoint'=>'http://www.example.com/my-endpoint.php',
'Correlator'=>md5(uniqid())
Now your script my-endpoint.php I am assuming they have said how they will return their reply, probably as POST variable. You process their reply basically like you would a submitted form from your own site.
So for example if their reply is POSTed
<?php
// initial testing to see what comes back from them
// as this wont be associated with a browser
// dump their reply to a file so you can see whats there
file_put_contents('reply.txt', print_r($_POST, true), FILE_APPEND);
?>
With the info you have provided this is about a much as I can do.