Miva - mvt:call to PHP-middleware to perform HTTP GET with POST Data

step_01--miva-template.xml

<mvt:assign name="l.data_for_api:thing_1" value="'Foobar'" />
<mvt:assign name="l.data_for_api:thing_2" value="'Lorem ipsum...'" />
<mvt:capture variable="l.json_string">
	<mvt:do file="g.Module_JSON" name="l.success" value="JSON_Output( l.data_for_api )" />
</mvt:capture>

<mvt:call action="'https://ssoule.mivamerchantdev.com/php/mvt-call-converter.php'" method="'GET'" fields="'json_string'">
	<mvt:eval expr="s.callvalue" />
</mvt:call>

step_02--mvt-call-converter.php

<?php

$url = 'https://ssoule.mivamerchantdev.com/php/example-api.php';

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($ch, CURLOPT_POSTFIELDS, $_REQUEST['json_string']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);

echo $result;

step_03--example-api.php

<?php

$fp = fopen('php://input', 'r');
$data_for_api = stream_get_contents($fp);

echo "Request Method: " . $_SERVER['REQUEST_METHOD'] . "\n\n";

echo "l.data_for_api: \n\n $data_for_api";

step_04--example-api-output.txt

Request Method: GET

l.data_for_api:
{
  "thing_1": "Foobar",
  "thing_2": "Lorem ipsum..."
}