Laravel Controller use same object in two functions

Is there a way to use a object variable instantiated from a class in two functions?

I am trying to, but, it returns me null

class bookAppointmentsController extends APIController
{
    private $business;  

public funcition check($key)
{
    $this->business = new APIClass();
    $setconnection = $this->business->connectAPI($key);

public function book()
{
   dd($this->business) //returns null
   $this->business->book();

I am trying to use the $business object in two functions but it does not work, when I dd($business) it returns null

Any way to do this?

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