app/Http/Controllers/Auth/AuthController.php
public function getRegister(Request $request)
    {
        if (Spark::forcingPromotion() && ! $request->query('coupon')) {
            if (count($request->query()) > 0) {
                return redirect($request->fullUrl().'&coupon='.Spark::forcedPromotion());
            } else {
                return redirect($request->fullUrl().'?coupon='.Spark::forcedPromotion());
            }
        }

        if (count($this->plans->paid()) > 0) {
            return view('spark::auth.registration.subscription');
        } else {
            return view('spark::auth.registration.simple');
        }
    }
public function getRegister(Request $request)
    {
        if (Spark::forcingPromotion() && ! $request->query('coupon')) {
            if (count($request->query()) > 0) {
                return redirect($request->fullUrl().'&coupon='.Spark::forcedPromotion());
            } else {
                return redirect($request->fullUrl().'?coupon='.Spark::forcedPromotion());
            }
        }

        if (count($this->plans->paid()) > 0) {
            return view('spark::auth.registration.subscription');
        } else {
            return view('spark::auth.registration.simple');
        }
    }
Show the application registration form.

@param  \Illuminate\Http\Request
@return \Illuminate\Http\Response