Process payment on server Apply Pay Stripe

I am trying to process Apple Pay using Stripe on the backend however I am getting stuck with the completion block. The documentation has the following steps:

1. Request payment intent which will return a client-secret key
2. Pass client-secret to completion block
3. didComplete is called

However I am taking a different approach:

1. Pass payment method id to backend
2. Backend runs logic and creates payment intent and captures charge
3. Client receives 200
4. Completion block to activate didComplete

Step 4 is where the error occurs. Calling the completion block without a client-secret key crashes the app.

STPIntentClientSecretCompletionBlock - requires optional string for first parameter which is the client-secret

func applePayContext(_ context: STPApplePayContext, didCreatePaymentMethod paymentMethod: STPPaymentMethod, paymentInformation: PKPayment, completion: @escaping STPIntentClientSecretCompletionBlock) {
        sudo code:
        API.makePayment(paymentInformation.stripeId)
        completion(nil, nil)
    }
    
    func applePayContext(_ context: STPApplePayContext, didCompleteWith status: STPPaymentStatus, error: Error?) {
        switch status {
        case .success:
            break
        case .error:
            break
        case .userCancellation:
            break
        @unknown default:
            fatalError()
        }
    }