# Sdkkey cannot be empty **URL:** \ **Category:** Web\ **Tags:** sdk\ **Created:** [May 10, 2023, 11:12am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156 "2023-05-10T11:12:45Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![ajinkya.kulkarni](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ajinkya.kulkarni](https://devforum.zoom.us/u/ajinkya.kulkarni)\ **Post date:** [May 10, 2023, 11:12am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/1 "2023-05-10T11:12:45Z")
When I upgraded zoom web SDK to 2.12.0, started getting error while starting the meeting “SDK key cannot be empty” Can anyone help? ---
**Author:** ![elisa.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/elisa.zoom/32/47836_2.png) [@elisa.zoom](https://devforum.zoom.us/u/elisa.zoom)\ **Post date:** [May 10, 2023, 8:20pm UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/2 "2023-05-10T20:20:26Z")
Hi @ajinkya.kulkarni Thanks for reaching out to us. Can you please make sure that you are adding your SDK key correctly to your code? ---
**Author:** ![ajinkya.kulkarni](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ajinkya.kulkarni](https://devforum.zoom.us/u/ajinkya.kulkarni)\ **Post date:** [May 11, 2023, 4:56am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/3 "2023-05-11T04:56:59Z")
Here is how we generate the signature (PHP)- ````auto $time = time() * 1000 - 30000; //time in milliseconds (or close enough) $data = base64_encode($api_key . $meeting_number . $time . $role); $hash = hash_hmac('sha256', $data, $api_secret, true); $_sig = $api_key . "." . $meeting_number . "." . $time . "." . $role . "." . base64_encode($hash); //return signature, url safe base64 encoded $signature = rtrim(strtr(base64_encode($_sig), '+/', '-_'), '=');``` And here is how we Join the meeting - ```` $.post( apachehost + “API/authenticate/generate\_signature”, { action: “sign”, meetingNumber: meetingNumber, role: role, //1 for admin }, function (data) { var response\_string = JSON.parse(data); console.log(api\_key, userName, response\_string); client.join({ sdkKey: api\_key, signature: response\_string.data.signature, meetingNumber: meetingNumber, password: meetingPwd, userName: userName, }).then(function (response) { $(“#join\_publish\_button”).hide(); $(“#save\_recording\_btn”).show(); loadingSpinnerModal(“loader”, “Connecting … Please wait …”, false); }) .catch(function (error) { loadingSpinnerModal(“loader”, “Connecting … Please wait …”, false); console.log(“ZoomError”, error); showError(“Some error connecting the live lecture … Please try again”); });; } ); ```auto Now it says Signature invalid! Join failed! ``` ---
**Author:** ![j.schoenemeyer](https://avatars.discourse-cdn.com/v4/letter/j/f9ae1b/32.png) [@j.schoenemeyer](https://devforum.zoom.us/u/j.schoenemeyer)\ **Post date:** [May 11, 2023, 5:19am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/4 "2023-05-11T05:19:35Z")
SDK 2.12.0 does’t support **JWT app** anymore - you have to migrate to **Meeting SDK app** with the new types of signatures [https://developers.zoom.us/docs/internal-apps/jwt-app-migration/#jwt-app-type-to-sdk-app-type-migration](https://developers.zoom.us/docs/internal-apps/jwt-app-migration/#jwt-app-type-to-sdk-app-type-migration) important: if you create a new Meeting SDK app ![id](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/f/2/f22699916674842c6e256a3f17d0f51dfd29b21e.png) ---
**Author:** ![ajinkya.kulkarni](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ajinkya.kulkarni](https://devforum.zoom.us/u/ajinkya.kulkarni)\ **Post date:** [May 11, 2023, 10:31am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/5 "2023-05-11T10:31:49Z")
I am calling Zoom APIs and using access token with JWT. Do I have to migrate that as well? ---
**Author:** ![j.schoenemeyer](https://avatars.discourse-cdn.com/v4/letter/j/f9ae1b/32.png) [@j.schoenemeyer](https://devforum.zoom.us/u/j.schoenemeyer)\ **Post date:** [May 11, 2023, 3:47pm UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/6 "2023-05-11T15:47:57Z")
you need Server-to-Server Oauth app for API calls > [@cURL call to get users with JWT token - not working](https://devforum.zoom.us/t/curl-call-to-get-users-with-jwt-token-not-working/88125/2): > > Hi @captainben99 Thanks for reaching out to the Zoom Developer Forum and welcome to our community! I am happy to help here! If my understanding is correct after reading your post, it looks like you are trying to generate a JWT token using the meeting SDK app credentials and that’s the reason why you are getting that error. So, question 1: WIth the API calls, is the token used supposed to be the JWT token? I am NOT using OAuth at all right now, although I did get my callback to work save the… ---
**Author:** ![j.schoenemeyer](https://avatars.discourse-cdn.com/v4/letter/j/f9ae1b/32.png) [@j.schoenemeyer](https://devforum.zoom.us/u/j.schoenemeyer)\ **Post date:** [May 11, 2023, 3:54pm UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/7 "2023-05-11T15:54:51Z")
here another info - it seems you can use meeting SDK credentials for API calls > [@Upgrading SDK version and switching from JWT app to Server-To-Server OAuth](https://devforum.zoom.us/t/upgrading-sdk-version-and-switching-from-jwt-app-to-server-to-server-oauth/87758/6): > > @vishwajeetbhosale Question: Is it possible to keep the same flow as it was with JWT App type? Answer: Could you elaborate on what is the “flow” you want to keep? Question: Can we use same SDK Key & Secrete for meeting & API OR SDK is only for Web Meeting & OAuth for ZOOM Rest API (I’m using Get user, Get Meeting, Create Meeting, Create User etc.) Answer: If you are using a recently created Meeting SDK App Type, you will have Client ID and Client Secret as your credentials. This can be used … ---
**Author:** ![ajinkya.kulkarni](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ajinkya.kulkarni](https://devforum.zoom.us/u/ajinkya.kulkarni)\ **Post date:** [May 13, 2023, 1:18pm UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/8 "2023-05-13T13:18:32Z")
I am getting Signature expired error when trying to create a signature with Server to Server Auth credentials - This is the code ```auto $time = round( ( time() * 1000 - 30000 ) / 1000 ); $exp = $time + 86400; //$exp = ($time + 21600000); //6 hour expiry $time = $time * 1000; $exp = $exp * 1000; $headers = array( 'alg' => 'HS256', //alg is required. see *Algorithms* section for supported algorithms 'typ' => 'JWT' ); // anything that json serializable $payload = array( 'sdkKey' => $api_key, 'appKey' => $api_key, 'mn' => $meeting_number, 'role' => $role, 'iat' => $time, 'exp' => $exp, 'tokenExp' => $exp ); //$key = 'some-secret-for-hmac'; $jws = new \Gamegos\JWS\JWS(); $signature = $jws->encode($headers, $payload, $api_key); ``` ---
**Author:** ![chunsiong.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chunsiong.zoom/32/35488_2.png) [@chunsiong.zoom](https://devforum.zoom.us/u/chunsiong.zoom)\ **Post date:** [May 15, 2023, 1:19am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/9 "2023-05-15T01:19:31Z")
do you have a sample of the created JWT token? ---
**Author:** ![j.schoenemeyer](https://avatars.discourse-cdn.com/v4/letter/j/f9ae1b/32.png) [@j.schoenemeyer](https://devforum.zoom.us/u/j.schoenemeyer)\ **Post date:** [May 15, 2023, 5:27am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/10 "2023-05-15T05:27:58Z")
> [@ajinkya.kulkarni](#): > > ```auto > $time = round( ( time() * 1000 - 30000 ) / 1000 ); > $exp = $time + 86400; > > $time = $time * 1000; > $exp = $exp * 1000; > > ``` you are using **millisconds** (depr. JWT app) - you have to use **seconds** (Meeting SDK app) > [@How do I generate a valid SDK signature from PHP?](https://devforum.zoom.us/t/how-do-i-generate-a-valid-sdk-signature-from-php/70691/5): > > @SVIF Here is example SDK Signature in PHP: \ **Author:** ![ajinkya.kulkarni](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ajinkya.kulkarni](https://devforum.zoom.us/u/ajinkya.kulkarni)\ **Post date:** [May 16, 2023, 6:02am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/11 "2023-05-16T06:02:10Z") Now this this code, I’m getting Signature is invalid (Using firebase JWT) ```auto $iat = time(); $exp = $iat + 60 * 60 * 2; // $token_payload = [ // 'sdkKey' => $api_key, // 'mn' => $meeting_number, // 'role' => $role, // 'iat' => $iat, // 'exp' => $exp, // 'tokenExp' => $exp // ]; $token_payload = array( 'sdkKey' => $api_key, 'appKey' => $api_key, 'mn' => $meeting_number, 'role' => $role, 'iat' => $iat, 'exp' => $exp, 'tokenExp' => $exp ); $signature = JWT::encode($token_payload, $api_secret, 'HS256'); ``` ---
**Author:** ![donte.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/donte.zoom/32/24412_2.png) [@donte.zoom](https://devforum.zoom.us/u/donte.zoom)\ **Post date:** [June 1, 2023, 3:52pm UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/12 "2023-06-01T15:52:09Z")
@ajinkya.kulkarni . Thank you for posting in the Zoom Developer Forum. Please take a look at this helpful blog post for guidance on troubleshooting SDK JWT behavior. > **[Troubleshooting Zoom Meeting SDK Signature Validation](https://dev.to/zoom/troubleshooting-zoom-meeting-sdk-signature-validation-1hln)** > > In this guide, we’ll cover common issues you may run into when generating a signature for the Zoom... ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\ **Post date:** [July 2, 2023, 1:52am UTC](https://devforum.zoom.us/t/sdkkey-cannot-be-empty/88156/13 "2023-07-02T01:52:16Z")
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