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PaddleOCR
Awesome multilingual OCR toolkits based on PaddlePaddle (practical ultra lightweight OCR system, support 80+ languages recognition, provide data annotation and synthesis tools, support training and deployment among server, mobile, embedded and IoT devices)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Have you tried Tesseract? https://tesseract-ocr.github.io/
I suggest looking into PaddleOCR as an alternative: https://github.com/PaddlePaddle/PaddleOCR. It is a less mature but more current OCR solution that is basically just a collection of pretrained ML models and how to use them, but they have everything and more that would be required to extract useful information from receipt image data taken from a camera. You can use their C++ inference deployment tools and use them in your application that way.