Here is an example URL that calls the API endpoint:

https://clinics-api.herokuapp.com/clinics/postcode/cr91pj

It provides a JSON response with results that match the full postcode only:

{
    "results" : [
        {
            "organisation_id" : "58961",
            "name" : "Edridge Road Community Health Centre"
        },
        {
            "organisation_id" : "77668",
            "name" : "Edridge Road Walk-In Centre"
        }
    ]
}

Here is an example URL that calls the API endpoint:

https://clinics-api.herokuapp.com/clinics/city/croydon

It provides a JSON response with a results object that contains all of the partial postcodes found and how many of them where found.

{
    "results" : {
        "CR9" : 2,
        "CR0" : 8
    }
}