Once the customer is linked, the customer's id can be requested as follows:
customer.GetCustomer((customerModel) =>
{
// Do something
}, (code, message) =>
{
// Do something else
});
And the customer's information fields as seen below:
customer.GetCustomerInformation((new string[] {"field1", "field2"}),
(customerModel) =>
{
// Do something
}, (code, message) =>
{
// Do something else
});