在php中创建tv_grab_en_telerama签名

I have recently taken a project for creating telerama API, which is in perl.

Can you guide me how I can generate the signature in PHP for the following URL https://api.telerama.fr/v1/application/initialisation?appareil=android_t...

I just need to know the second parameters for the following

$signature = hash_hmac("sha1", __MISSING_ ,'Eufea9cuweuHeif');

Once I have the signature I can easily put in, this URL and read the json

https://api.telerama.fr/v1/application/initialisation?appareil=android_t...

Any help will be appreciated. If you can point me to the link for telerama API details that will be helpful as well.