public void TestCustomers()
{
// SUBSCRIBE
// Arrange
ICustomerEntity customer = CreateMockCustomer();
// Act
StripeManager.CreateCustomer(customer);
// Assert
Assert.IsNotNull(customer.PaymentSystemId);
// RETRIEVE
// Act
StripeCustomer stripeCustomer = StripeManager.RetrieveCustomer(customer);
// Assert
Assert.IsNotNull(stripeCustomer);
// UPDATE
// Arrange
customer.Email = "*****@*****.**";
// act
StripeCustomer updatedStripeCustomer = StripeManager.UpdateCustomer(customer);
// Assert
Assert.IsNotNull(updatedStripeCustomer);
}