This method opts in a given contact to preferences, or opts out a given contact from preferences.

Opting in contacts to a preference

Set the isOptedIn key to true

Opting out contacts from a preference

Set the isOptedIn key to false

SOAP action: http://apiconnector.com/v2/ApiService/SetPreferencesForContact

📘
Input and output parameters
Input parameters

ContactID - integer or ContactEmailAddress - string

PreferenceID - integer

IsPreference - boolean

IsOptedIn - boolean

Output parameters

PreferenceID - integer

IsPreference - boolean

IsOptedIn - boolean

Example

using (var client = new ApiServiceClient())
{
client.ClientCredentials.UserName.UserName = "username";
client.ClientCredentials.UserName.Password = "password";

var contactId = 8545;

var preferences = client.GetContactPreferencesByIDAsync(contactId).Result;

preferences[0].Preferences[0].IsOptedIn = true;
preferences[0].Preferences[1].IsOptedIn = true;

client.SetPreferencesForContactAsync(contactId, preferences).Wait();              
}