You need to log into your Betterez backend and visit the admin area.

In there click the applications menu item.

You will see a series of applications listed.

You shoud create a new application for your custom development. This will allow you to use your own public and private keys and rotate those keys as you wish.

Your public api key should be used in the X-API-KEY header when making a request to the Betterez API.

For example in curl you will do this:

curl --request GET \
  --url https://api.betterez.com/inventory/countries \
  --header 'x-api-key: {{x-api-key}}'