/// <summary>
/// Performs a subscription upgrade.
/// </summary>
/// <param name="newEntity">The subscription upgrade to perform.</param>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
/// <returns>The subscription upgrade result.</returns>
public async Task <UpgradeResult> CreateAsync(Upgrade newEntity, CancellationToken cancellationToken = default)
{
newEntity.AssertNotNull(nameof(newEntity));
return(await Partner.ServiceClient.PostAsync <Upgrade, UpgradeResult>(
new Uri(
string.Format(
CultureInfo.InvariantCulture,
$"/{PartnerService.Instance.ApiVersion}/{PartnerService.Instance.Configuration.Apis.PostSubscriptionUpgrade.Path}",
Context.Item1,
Context.Item2),
UriKind.Relative),
newEntity,
cancellationToken).ConfigureAwait(false));
}