retrieve:
Return the details about the given Registration id.

list:
List all Registration objects.

GET /api/v1/registrations/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "count": 4,
    "results": [
        {
            "id": 1,
            "fr_label": "Sur inscription",
            "en_label": "Registration required"
        },
        {
            "id": 2,
            "fr_label": "Sur invitation",
            "en_label": "Invitation required"
        },
        {
            "id": 3,
            "fr_label": "Entrée libre",
            "en_label": "Free"
        },
        {
            "id": 4,
            "fr_label": "Complet",
            "en_label": "Sold Out"
        }
    ]
}