/// <summary>
/// Initiates a link between an external identity and an existing customer.
/// </summary>
/// <param name="emailAddressOfExistingCustomer">The email address of existing customer.</param>
/// <param name="emailTemplateId">The email template identifier.</param>
/// <param name="emailTemplateProperties">The email template properties.</param>
/// <returns>
/// A task.
/// </returns>
public virtual async Task <LinkToExistingCustomerResult> InitiateLinkExternalIdToExistingCustomer(string emailAddressOfExistingCustomer, string emailTemplateId, IEnumerable <NameValuePair> emailTemplateProperties)
{
string activationToken = System.Guid.NewGuid().ToString();
IStoreOperationsManager storeOperationsManager = Utilities.GetManagerFactory(this.EcommerceContext).GetManager <IStoreOperationsManager>();
LinkToExistingCustomerResult linkResult = await storeOperationsManager.InitiateLinkToExistingCustomer(emailAddressOfExistingCustomer, activationToken, emailTemplateId, emailTemplateProperties);
return(linkResult);
}