Facebook cURL for custom conversion tracking API error 100

Question

I'm getting an error from Facebook API.

string(135) "{"error":{"message":"(#100) The parameter data is required","type":"OAuthException","code":100,"fbtrace_id":"AGpuvWfJHaG5Dyx4ffRZ_e-"}}"

Here is their documentation: https://developers.facebook.com/docs/marketing-api/conversions-api/using-the-api

I have used the PayLoad Builder to create my PayLoad and used cURL to post it.

https://developers.facebook.com/docs/marketing-api/conversions-api/payload-helper/

` $pixelID = "MY PIXEL ID";
 $token = "MY TOKEN";
 $url = "https://graph.facebook.com/v10.0/$pixelID/events?access_token=$token";
$testEvent = "MY TEST ID";
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$headers = array(
 // "content-type: application/json",
);
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
$data = '{
 "data": [
 {
 "event_name": "Purchase",
 "event_time": ' . $timestamp . ',
 "action_source": "website",
 "user_data": {
 "em": [
 "' . $email . '"
 ],
 "ph": [
 "' . $phonenumber . '"
 ],
 "fn": [
 "' . $firstName . '"
 ],
 "ln": [
 "' . $lastName . '"
 ],
 "ct": [
 "' . $city . '"
 ],
 "st": [
 "' . $county . '"
 ],
 "zp": [
 "' . $postCode . '"
 ],
 "country": [
 "0b407281768f0e833afef47ed464b6571d01ca4d53c12ce5c51d1462f4ad6677"
 ]
 },
 "custom_data": {
 "currency": "GBP",
 "value": "' . (float)$paytotal . '"
 }
 }
 ]
 },
 "test_event_code":"' . $testEvent . '"
';
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
$resp = curl_exec($curl);
curl_close($curl);
var_dump($resp);`

Can anyone help me to understand the issue? So far as I can tell I am sending "data:"

For completeness here is what arrives if I print $data

{
 "data": [
 {
 "event_name": "Purchase",
 "event_time": 1712266200,
 "action_source": "website",
 "user_data": {
 "em": [
 "74fede2a4644b6d958b33e48d085c6dcf1434cf74ac29486c824c64c62f4341b"
 ],
 "ph": [
 ""
 ],
 "fn": [
 "068b525cc8cebb28ec7f75c1814c9f9725ccb7a76e6f149049603f504ca5b668"
 ],
 "ln": [
 "7efa869d0364eea0cd0106a2ef4d1ae9eaec58fe62928c3f1af8fa8da9204ea0"
 ],
 "ct": [
 "0906246e56d65f9c0cc0929544494b52598175ebb86932e28727f1ebef16137e"
 ],
 "st": [
 "c153d60ae29ef1a1577a09285cece714e80f02904eb9a244e92d60d199901b9c"
 ],
 "zp": [
 "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
 ],
 "country": [
 "0b407281768f0e833afef47ed464b6571d01ca4d53c12ce5c51d1462f4ad6677"
 ]
 },
 "custom_data": {
 "currency": "GBP",
 "value": "112.5"
 }
 }
 ]
 },
 "test_event_code":"TEST7672"
 string(135) "{"error":{"message":"(#100) The parameter data is required","type":"OAuthException","code":100,"fbtrace_id":"AhL2jsc1CX21JzfetlQMjwZ"}}"
 

• Eoin: I'm wondering if it's because I need to set this to fill in a form as their example is using -F

Answer 1

My final code was this. I hope it helps someone in the future.

$curl = curl_init($url);
 curl_setopt($curl, CURLOPT_URL, $url);
 curl_setopt($curl, CURLOPT_POST, true);
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 $headers = array(
 "content-type: application/json",
 );
 
 curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
 
 $data = [
 'data' => [
 [
 'event_name' => 'Purchase',
 'event_time' => time(),
 'action_source' => "website",
 'user_data' => [
 'em' => [$email],
 'ph' => [$phonenumber],
 'fn' => [$firstName],
 'ln' => [$lastName],
 'ct' => [$city],
 'st' => [$county],
 'zp' => [$postCode],
 'country' => [
 "0b407281768f0e833afef47ed464b6571d01ca4d53c12ce5c51d1462f4ad6677"
 ]
 ],
 'custom_data' => [
 'currency' => 'GBP',
 'value' => (float)$totalPaid
 ]
 ]
 ]//,
 // 'test_event_code' => $testEvent
 ];
 
 curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
 // print_r($data);
 $resp = curl_exec($curl);
 curl_close($curl);
 // var_dump($resp);

I think we just had to send things as key/pair and make sure it was JSON encoded.