Automatic processing of invoices (PDF → LIamaindexs → SAP)

Project description:
- Receiving PDF files via Webhook
- Recognition and parsing of data from documents using LlamaIndex (Parsing API)
- Verification of the correctness and presence of mandatory fields
- Error handling and implementation of retry logic
- Transmission of validated data to a third-party service via REST API
- Sending status messages about processing in Telegram