1) I create my test app, that request scopes: 

"read:user",
"read:site"

2) I make outh flow to get valid access_token

3) I make request like this->

And the error is 

{"error":{"code":403,"message":"Unknown api key provided."}}

 What is wrong with my request?

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what i want is to use Weebly API to access some data from this chunk of code:

 // get token from auth code
        $token = $wc->getAccessToken($dto->getAuthorizationCode(), $dto->getCallbackUrl());

        // check for a valid return
        if($token->access_token !== null) {

            $userData = $this->weeblyService->getUserInfo($dto->getUserId(), $token->access_token); - write there. Is it possible?

            $response = new RedirectResponse($token->callback_url);

            return $response;