In order to get started with Paymo, you need to go to your Zapier account -> click on your profile -> Connected accounts -> Connect new account and search for Paymo in the app list.
Next you will see a screen where you will need to add a Paymo account and the Paymo API key
You will be able to find the API key in your Paymo account by clicking on your name -> Settings for your user
Next scroll down to API keys -> generate an API key -> copy it to your Zapier account -> click continue.
Now you’re all setup and can create new Paymo Zaps.