$params  = wp_fusion()->crm->get_params(); // Get the authentication headers
$request = 'https://api.hubapi.com/crm/v3/objects/contacts/search';

$search = array(
    'filterGroups' => array(
        'filters' => array(
            'propertyName' => 'firstname',
            'operator'     => 'EQ',
            'value'        => 'Alice',
        ),
    ),
);

$params['body'] = json_encode( $search );

$result = wp_remote_post( $request, $params );