wp_remote_post() body empty - json

Question

I am trying to build a plugin that sends webhooks to an external site from client sites so I can keep a record of everything that happens from when a user signs in, to when someone installs a new plugin or updates or adds new pages etc.
The problem is I am receiving NULL values through the $api array, and can't seem to figure it out.
This is my last attempt and making this work:
function send_webhook_on_plugin_install( $install_result, $package, $api ) {
$webhook_url = 'https://example.com';
$installed_plugins = get_plugins();
$installed_plugins = array_keys( $installed_plugins );
$new_plugin = false;
$new_plugin_name = '';
$new_plugin_version = '';
foreach ( $installed_plugins as $installed_plugin ) {
if ( ! in_array( $installed_plugin, $package ) ) {
$new_plugin = $installed_plugin;
break;
}
}
if ( $new_plugin ) {
$new_plugin_data = get_plugins( '/' . $new_plugin );
$new_plugin_name = $new_plugin_data[ $new_plugin ]['Name'];
$new_plugin_version = $new_plugin_data[ $new_plugin ]['Version'];
}
$body = array(
'plugin_name' => $new_plugin_name,
'plugin_version' => $new_plugin_version
);
$response = wp_remote_post( $webhook_url, array(
'method' => 'POST',
'timeout' => 45,
'redirection' => 5,
'httpversion' => '1.0',
'blocking' => true,
'headers' => array( 'Content-Type' => 'application/json' ),
'body' => wp_json_encode( $body ),
'cookies' => array()
) );
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
// Log the error
error_log( "Webhook failed: $error_message" );
}
}
add_action( 'upgrader_post_install', 'send_webhook_on_plugin_install', 10, 3 );
The JSON that is being received is:
{
"plugin_name": null,
"plugin_version": null
}
The Warnings I'm getting are this:
PHP Warning: Undefined array key "advanced-custom-fields-pro/acf.php" in C:\xampp\htdocs\site\wp-content\plugins\webhook-sender\plugin-update.php on line 25
PHP Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\site\wp-content\plugins\webhook-sender\plugin-update.php on line 25
Previous Versions of the code that also failed:
function send_webhook_on_plugin_install( $install_result, $package, $api ) {
$webhook_url = 'https://example.com';
$body = array(
'plugin_name' => $api['name'],
'plugin_version' => $api['version']
);
$response = wp_remote_post( $webhook_url, array(
'method' => 'POST',
'timeout' => 45,
'redirection' => 5,
'httpversion' => '1.0',
'blocking' => true,
'headers' => array( 'Content-Type' => 'application/json' ),
'body' => wp_json_encode( $body ),
'cookies' => array()
) );
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
// Log the error
error_log( "Webhook failed: $error_message" );
}
}
add_action( 'upgrader_post_install', 'send_webhook_on_plugin_install', 10, 3 );
I thought by accessing $api array directly might work, but still getting NULL values on the return.
and...
function send_webhook_on_plugin_install( $install_result, $package, $api ) {
$webhook_url = 'https://example.com';
$body = array(
'plugin_name' => $api->name,
'plugin_version' => $api->version
);
$response = wp_remote_post( $webhook_url, array(
'method' => 'POST',
'timeout' => 45,
'redirection' => 5,
'httpversion' => '1.0',
'blocking' => true,
'headers' => array( 'Content-Type' => 'application/json' ),
'body' => wp_json_encode( $body ),
'cookies' => array()
) );
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
// Log the error
error_log( "Webhook failed: $error_message" );
}
}
add_action( 'upgrader_post_install', 'send_webhook_on_plugin_install', 10, 3 );