You will need to get your Square account App ID and Access Token. This is how you do that in Square:
1. Go to https://developer.squareup.com and login with your credentials.
2. Click Developer Dashboard.
3. Click on + New Application.
4. Name the application (Flexcatering) and click on Create Application > Square will auto-generate the information needed for integration.
5. The Location ID(s) for your Square account can be found in the Locations tab of your Developer Dashboard (you can view only the locations here).
6. Make sure you are using the Production Keys – they are the live ones.