/// <summary>
/// Adds Parbad pre-configured services to the specified <see cref="IServiceCollection"/>.
/// </summary>
public static IParbadBuilder AddParbad(this IServiceCollection services)
{
var builder = new ParbadBuilder(services);
builder.Services.AddOptions();
builder.Services.TryAddTransient <IOnlinePayment, DefaultOnlinePayment>();
builder.Services.TryAddSingleton <IOnlinePaymentAccessor, OnlinePaymentAccessor>();
builder.Services.TryAddTransient <IInvoiceBuilder, DefaultInvoiceBuilder>();
builder.Services.TryAddTransient <IGatewayProvider, GatewayProvider>();
builder.Services.TryAddTransient <AutoIncrementTrackingNumberProvider>();
builder.Services.TryAddTransient <AutoRandomTrackingNumberProvider>();
builder.ConfigureMessages(options => { });
builder.ConfigurePaymentToken(tokenBuilder => tokenBuilder.UseGuidQueryStringPaymentTokenProvider());
return(builder);
}