Hello @kubric , 

Check this link https://developers.klaviyo.com/en/reference/api_overview

we can find REST API’s which is simple to call those API’s and integrate. 

Thanks
Aaron

Based on this does this mean if you want to allow a customer to use their Klaviyo data with your app they need to create a private key and share it with you?

Thanks,

Henry

Hi @talktohenryj!
 

Here’s our updated guide on how to integration with a platform that doesn’t have a pre-built integration with Klaviyo:

• https://developers.klaviyo.com/en/docs/guide_to_integrating_a_platform_without_a_pre_built_klaviyo_integration

And it depends on your use case, but you likely won’t need to (and shouldn’t) share your private API keys with anyone outside of your organization.

Best,

Brian