Go to https://developer.paypal.com and log in using your PayPal Business account credentials.
Note: Logging into the PayPal Developer Dashboard is required to create a PayPal App and access your Client ID and Secret key. These API credentials are necessary for securely connecting your PayPal account to Go High Level and enabling payment processing.
In Thrive Funnels, Go to the Payments tab > Integrations > and click Connect on Paypal option
Here you have to add the Client ID and Secret ID or Secret Key for both Sandbox and Live Environments from Paypal
FOR SANDBOX:
To get the Sandbox Client ID and Secret ID, go back to https://developer.paypal.com
Toggle from Live to Sandbox, click Apps & Credentials then click Create App
Fill in the App Name, choose Merchant as app type then click Create App
After Creating the app, you will be redirected to the page with the Client ID and Secret Key
Copy and Paste them to Thrive Funnels then click Save
Repeat the same process for Live environment