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Admin or Owner access to your Mailgun account is required to manage API keys.

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Generate a New API Key

Create a new Mailgun API Key from the Mailgun Control Panel to authenticate API requests.

1

Log in to Mailgun

Sign in to your Mailgun Control Panel.

2

Navigate to API Security

Click your account name in the top-right corner, then select API Security from the dropdown menu.

3

Create a New API Key

In the Mailgun API keys section, click the Create key button on the right side to open the key creation dialog.

  • Enter a description to identify the key’s purpose (e.g., StackOne Integration).
  • Click Create key to generate the new API key.
4

Copy Your API Key

Once generated, copy the new API key immediately and store it securely.

  • Private API Key format: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxxxx-xxxxxxxx
  • Click Copy to clipboard to copy the key.
  • Important: This API key is displayed only once. If you lose it, you’ll need to delete the key and generate a new one.
  • Keep your Private API Key secure — it grants full access to your Mailgun account.

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Linking the Account from the Hub

1

Navigate to the Hub

Use one of the three Linking Account Methods to access the Hub.
2

Fill out the fields

Fill out the following fields using details from your provider:
  • Private API Key
3

Connect

  • Click Connect
  • If applicable, the provider will redirect you to a sign-in or authorization page. Complete the provider’s authorization flow.
  • Once authorization is successful, you will see a confirmation popup

If the account linking is successful, you will see the newly linked account in your Accounts page.