Table of Contents
...
From within a MailUp account
Select "Build your own MailUp applicationCreate a developer account to get started" on the bottom of Settings > Account settings > Developer's corner > Integrations web page
Confirming your request
Once you submit the form, you will receive a confirmation email. Click in the link in the email to confirm the request and activate your MailUp Developer Account.
...
Do not submit your integration if it's for internal use or testing purposes (i.e. the integration will work properly anyway).
Why application keys separate from account credentials?
...