Affordable Turnitin/iThenticate API Website Integration

Looking for a low-cost Turnitin / iThenticate API integration provider for my own website.

Requirements:

* Server-side automated file submission and result retrieval
* Similarity and AI Writing results
* Official Viewer / PDF reports
* Webhook / callback support
* No separate Turnitin or iThenticate account required on my side
* Stable service with scalable usage limits

Please DM me with API documentation, test access, usage limits, and your best price. Testing is required before payment.