In order to integrate your Zapier account with Popupsmart, please follow these steps;
You should first create a API key and copy the code.
Click and accept the invitation : https://zapier.com/platform/public-invite/5762/0c05b2e1319d3f03327da7171af8efc2/
You can create a zap now. Select the popupsmart from apps.
In the next step, you should put the API key into the window.
Then you can continue with another apps to integrate with more then 1.000 apps.