You can easily create a receipt using a thermal printer connected via Bluetooth.
Prepare the printer and perform pairing.

Then launch the app.

Receipt creation function can be used free of charge

About the app
・Scan the barcode printed on the desired product on the product 　　
　registration screen.
　Enter the product name and unit price that will be printed on the receipt
　when the scanned barcode is read, and press the product registration
　button.
・Press the scan button on the main screen to start barcode scanning.
・If there are multiple items of the same item, press the QTY button and
　enter the number before scanning the barcode.
・If multiple barcodes are recognized in the camera image, they cannot be
　entered correctly.
・Press the scan button during scanning to pause. Press during pause to
　resume scanning.
・Printer can be selected from width 58 mm or width 80 mm
・When you press the print button, the receipt will be printed and the scan
　will end.
・The camera uses the rear camera. If you want to use the front camera,
　change the settings.
・You can print a list of product registration status from the setting screen.
・Supports more than 70 countries
・Supports various languages ​​and currencies
　For example, Arabic, Bengali, Belarusian, Bulgarian, Myanmar, Greek,
　Hebrew, Hindi, Kannada, Khmer, Kyrgyz, Lao, Malayalam, Mongolian,
　Nepalese, Tamil, Telugu, Thai, Uighur, Tatar, Filipino, Hausa, Ivo, etc.
・Daily total, monthly total output(charged)

Requests and questions to the community below
https://github.com/ITODEN/Receipt_maker-barcode_scan-/discussions

This app has been confirmed to work with the following printers.
PT-210,LMP201,JP58H

See the video below for the initial settings for printer connection.
https://youtu.be/bZM22HVNA5k

If the product does not have a barcode, this app is recommended.
https://play.google.com/store/apps/details?id=com.register.registerpt_210