Pass Custom array of Object as a Parameter in API Retrofit PUT Call

I have to call an API to update the emergency contact of specific user.

https://stay-safe-api.azurewebsites.net/5eadd53761***0f6017/update/emergency_contact_details

//Body of API  
{
"EmergencyContacts": [
	{
		"FullName" : "Johon",
		"PhoneNumberCountryCode" : "ae",
		"PhoneNumberCountryDialCode" : "971",
		"PhoneNumber" : "5534566"
		
	}	
]
}

So I have an array which is I am passing in my API Call but whenever it's called, I got an error that inputs are incorrect.

I dont know what I am doing wrong I am actually new so can you guys help me out ?

APIInteface.class

@FormUrlEncoded
@PUT("update/emergency_contact_details")
Call<RegisterResponse> setEmergencyContact(@Field("EmergencyContacts[]") List<EmergencyList> 
EmergencyContacts);

APIClient.class

 public static Retrofit getClientEmerg(String id) {
    if (retrofit == null) {
        retrofit = new Retrofit.Builder()
                .baseUrl("https://stay-safe-api.azurewebsites.net" + id + "/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }
    return retrofit;
}

MainActivity.class

 ApiInterface apiInterface = ApiClient.getClientEmerg(id).create(ApiInterface.class);
    Call<RegisterResponse> call = apiInterface.setEmergencyContact(emergencyLists);
    call.enqueue(new Callback<RegisterResponse>() {
        @Override
        public void onResponse(Call<RegisterResponse> call, Response<RegisterResponse> response) {

         }
        @Override
        public void onFailure(Call<RegisterResponse> call, Throwable t) {
            progress.dismiss();
        }
    });


}

So let me know that what I am doing wrong in passing array as a param in API Call? Because I am getting error that "This is invalid request. Please make sure inputs are correct."

Thanks.

Try to use Body annotation in your ApiInterface instead (and get rid of FormUrlEncoded):

@PUT("update/emergency_contact_details")
Call<RegisterResponse> setEmergencyContact(@Body List<EmergencyList> EmergencyContacts);

Still it's strange why you need to send contacts' list though it seemed that endpoint includes id in path (so you can update by this PUT just one contact)