Thermal paper is trying to disappear
Shoot before the fade
Heat and sunlight bleach till tape. Capture the same evening. A perfect crop of a blank ribbon helps no one at tax time.
Curl, glare, and wallets
Unroll the slip. A glass table plus flash is a white rectangle. Side light, no flash, flatten with a notebook.
This is not bookkeeping software
We make a readable image or PDF. You still type the amount in Expensify, QuickBooks, or a spreadsheet. OCR of tiny thermal type is unreliable; do not bet an audit on it.