// Example Payload
    {
      "timezone": "America/Mexico_City",
      "pdf":"JVBERi0xLjcKCjEgMCBvYmogICUgZW50cnkgcG9pbn...ds+aP==",
      "signatures" : [
      {
        "hash" : "asdldsalkdsaj21j31kl321jk312jk312=",
        "email" : "test@mail.io",
        "name" : "Prueba 1"
      },
      {
        "hash" : "sdaklkk213hkj312jkh123hjk123hj2hjk31h=",
        "email" : "hola@mail.io",
        "name" : "Prueba 2"
      },
      {
        "hash" : "sdaklkk213hkj312jkh123hjk123hj2hjk31h=",
        "email" : "prueba3@mail.io",
        "name" : "Prueba 3"
      }],
      "params" : {
        "title" : "Titulo",
        "file_name" : "prueba.pdf",
        "logo": "YijhuYIOYGkjiphUYIOdgUTdfxYFLAdfKSHdfUOP...pY=="
      }
    }