Klaviyo documentation: API guide , Authentication
Start establishing a connection to Klaviyo in either of the following ways:
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From the Resources menu, select Connections. Then, click + Create connection at the top right.
– or –
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While working in a new or existing integration, you can add an application to a flow by clicking a source or destination. In the resulting Application list, select Klaviyo. Then, click the plus sign (+) to the right of Connection to edit the settings.
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Name: Required: Name the connection.
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API key: Required: Enter the API key. Use the following steps to get an API key:
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Log in to your Klaviyo account.
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Click Account.
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Under Settings, click API Keys to get the API key.
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Borrow concurrency from (optional): Select another connection from the list....
NOTE: Selecting another app changes form...
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Concurrency level (optional): Up to 25 allowed....