Hello! for an integration using lib Guzzle (PHP) I use this code:

$headers = [ 'headers' => [ 'X-RapidAPI-Key' => "XXXXXXXXXXXXXXXXXXXXXXXX", 'X-RapidAPI-Host' => "XXXXXXXXXXXXXXXXXXXXXXXX", ] ];$client = new Client($headers);$nombre = “JOSUE”;
$apellido_paterno = "OSORIO"$apellido_materno = “CONSTANTINO”;
$fecha = “1998-03-17”;

$res = client->request( 'GET', "https://jfhe88-rfc-generator-mexico.p.rapidapi.com/rest1/rfc/get?solo_homoclave=0&nombre=nombre&apellido_paterno=apellido_paterno&apellido_materno=apellido_materno&fecha=$fecha");

$results = json_decode($res->getBody()->getContents());

/** NOTES!:
-USE ALWAYS UPPER CASE;
-CLEAR TEXT FROM SPECIAL CHARACTERS ( ´, ñ, ');

Sorry for the identation, this textblock it won’t let me adjust it