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Dependency injection can be implemented for classes in Stripe.Net by following these steps:

1. Create an interface that represents the Stripe service you want to use, for example, an interface for the payment service:

public interface IPaymentService
{
    Charge CreateCharge(ChargeCreateOptions options);
}

1. Implement the interface using the Stripe service, for example:

public class StripePaymentService : IPaymentService
{
    private readonly StripeConfiguration _config;

    public StripePaymentService(StripeConfiguration config)
    {
        _config = config;
    }

    public Charge CreateCharge(ChargeCreateOptions options)
    {
        StripeConfiguration.ApiKey = _config.ApiKey;
        var service = new ChargeService();
        return service.Create(options);
    }
}

1. Configure your dependency injection container to use the Stripe implementation:

services.AddSingleton<StripeConfiguration>();
services.AddSingleton<IPaymentService, StripePaymentService>();

1. Inject the interface into your classes that need to use the Stripe service:

public class PaymentController : ControllerBase
{
    private readonly IPaymentService _paymentService;

    public PaymentController(IPaymentService paymentService)
    {
        _paymentService = paymentService;
    }

    [HttpPost]
    public IActionResult ProcessPayment([FromBody] PaymentRequest paymentRequest)
    {
        var options = new ChargeCreateOptions
        {
            Amount = paymentRequest.Amount,
            Currency = paymentRequest.Currency,
            Description = paymentRequest.Description,
            Source = paymentRequest.Source
        };

        var charge = _paymentService.CreateCharge(options);
        // ...
    }
}

By using dependency injection, you can easily switch out the implementation of the Stripe service or mock it for testing.