You can find it in your account settings under Rest API section and clicking API Key Management:
Secret key
You can find it in your account settings under Rest API section and clicking API Key Management.
Sender email
If you don't have a sender email, go to your account settings under the Sender & Domains section and click Add a Sender Domain. You can verify a single sender email (eg. jane@arengu.com) or your whole domain (eg. @arengu.com), to be used in your email actions.
You will need to use this value in your "Send Mailjet email" action in your Arengu flow:
Finally, close the settings and publish the changes, and test and debug it.
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