# I-track modules > The integration modules of PhotoRobot Academy, coded I01 to I04. Also known as: I01-I04. Category: Training and certification. I-track modules teach the technical side of connecting PhotoRobot to ERP, PIM and DAM systems through the API and webhooks. They are part of the Integrator Essentials track. ## How PhotoRobot uses it I01 covers API V2 fundamentals, I02 webhook architecture, I03 the shooting list and SKU lifecycle, and I04 OCR and custom data extraction. Together with shared B-track modules they form the [Integrator Essentials](https://www.photorobot.com/glossary/integrator-essentials) track; see the [curriculum outline](https://www.photorobot.com/academy/curriculum#i01-api-fundamentals). ## Related terms - [Integrator Essentials](https://www.photorobot.com/glossary/integrator-essentials): The PhotoRobot Academy certification track for software integrators. - [Webhook](https://www.photorobot.com/glossary/webhook): An HTTP request one system sends to another automatically when an event happens. - [PhotoRobot Cloud API](https://www.photorobot.com/glossary/cloud-api): PhotoRobot's REST API for integrating the studio with catalog, DAM, PIM and e-commerce systems. - [OCR (optical character recognition)](https://www.photorobot.com/glossary/ocr): Technology that converts text in an image into machine-readable text.