In this knowledgebase,

We have provided you the steps to get the client_id and secret while paypPayPalegration,

Step 1- Create a developer account from here.

Step 2- After creating the account, Go to the Dashboard.

Step 3- Then in the left menu, click on the My Apps & Credentials.

Step 4- Go to REST API apps section and click the create app button.

Step 5- Fill the App Name and choose the developer merchant account.

Step 6- Then create the app.

Step 7- After creating the app you have received the CLIENT_ID and SECRET.

Thanks maybe this knowledgebase is needful for you.