How do I implement fee collection with Stripe in my Blazor multitenant appointment platform?

I'm developing a multi-tenant Blazor web application for booking appointments. There are 2 types of appointments:

• one off: the user pays for a single session
• recurring until cancel: the user can book one session per week and the platform is charged monthly

For each payment, I need to deduct a small fee (to be transferred to my Stripe account) and send the remainder to the professional. I found these examples and Stripe documentation on transferring amounts with either an application_fee_amount or transfer_data[amount]:

• GitHub
• How to accept Stripe payments via Blazor in .NET 8
• Stripe documentation

Below is an example of creating a checkout session:

CSHARPCopied
StripeConfiguration.ApiKey = "sk_test_ESDdbUTrLo4e9SC7uoQqlhd2";

var options = new Stripe.Checkout.SessionCreateOptions
{
    LineItems = new List<Stripe.Checkout.SessionLineItemOptions>
    {
        new Stripe.Checkout.SessionLineItemOptions
        {
            PriceData = new Stripe.Checkout.SessionLineItemPriceDataOptions
            {
                Currency = "usd",
                ProductData = new Stripe.Checkout.SessionLineItemPriceDataProductDataOptions
                {
                    Name = "T-shirt",
                },
                UnitAmount = 1000,
            },
            Quantity = 1,
        },
    },
    PaymentIntentData = new Stripe.Checkout.SessionPaymentIntentDataOptions
    {
        ApplicationFeeAmount = 123,
        TransferData = new Stripe.Checkout.SessionPaymentIntentDataTransferDataOptions
        {
            Destination = "{{CONNECTED_ACCOUNT_ID}}",
        },
    },
    Mode = "payment",
    SuccessUrl = "https://example.com/success",
};
var service = new Stripe.Checkout.SessionService();
service.Create(options);

If I understand correctly, the {{CONNECTED_ACCOUNT_ID}} should be replaced with the connected (professional's) Stripe account ID (typically starting with acct_), and the StripeConfiguration.ApiKey is my platform’s secret API key. What do I need to adjust in my Blazor implementation to correctly collect and transfer the fee?