Customer.io helps businesses effectively reach and maintain customers through improved email campaigns. The Customer.io API allows developers to integrate with Customer.io through a RESTful interface. In addition to managing customer profiles, the API allows 3rd party applications to send behavioral events to customer.io. This write-only API supports HTTPS POST calls and requires an API Key.
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The Customer.io PHP Sample Code by Customer.io demonstrates API interaction, providing code to identify customers and track a customized event. Additional examples available at https://github.com/customerio/customerio-php/