var result = _onlinePayment.Request(invoice =>
{
   invoice
       // سایر مشخصات صورت حساب
       .SetAmount(50000)
       .AddMellatCumulativeAccount(subServiceId: 330, amount: 20000, payerId: 22)
       .AddMellatCumulativeAccount(subServiceId: 333, amount: 30000);
});

services.AddParbad()
           .ConfigureDatabase(builder =>
           {
              // Choose your database provider (SQL Server, MySql, Sqlite, etc.)
              builder.Use....
           })
           .ConfigureDatabaseInitializer(builder =>
           {
              builder.UseInitializer(async context =>
              {
                  await context.Database.EnsureDeletedAsync();

                  // OR
                  await context.Database.EnsureCreatedAsync();

                  // OR
                  await context.Database.MigrateAsync();
              });
           });

services.AddParbad()
           .ConfigureDatabase(builder =>
           {
              // Choose your Entity Framework provider (SQL Server, MySql, Sqlite, etc.)
              builder.Use....
           })
           .ConfigureDatabaseInitializer(builder =>
           {
              builder.CreateDatabase();

              // OR
              builder.DeleteAndCreateDatabase();

              // OR
              builder.CreateAndMigrateDatabase();
           });

services.AddParbad()
           .ConfigureDatabase(builder =>
           {
              // SQL Server
              builder.UseSqlServer("Connection String", options => options.UseParbadMigrations());
           })
           .ConfigureDatabaseInitializer(builder =>
           {
              builder.CreateAndMigrateDatabase();
           });

builder.UseSqlServer("Connection String", options => options.MigrationsAssembly("Parbad"));