Standard 2 of 5 barcode API
Simple digits-only barcode, also called Industrial 2 of 5, found in older warehouse and sorting systems.

What Standard 2 of 5 is for
Standard (Industrial) 2 of 5 stores digits in the bars alone, so it is wide but very tolerant of rough printing. It survives in older warehouse, sorting and ticketing systems.
Make one from a URL
Send the text and get the image back. Your API key goes in a header.
curl "https://barcode.fmdeploy.com/v2/barcode/standard2of5?text=1234567&label=true" \ -H "Authorization: Bearer bc_live_your_key" -o standard2of5.png
Add &output=svg for a vector image that stays sharp at any print size.
From FileMaker
Insert from URL [ Select ; With dialog: Off ; Target: Items::Barcode ; "https://barcode.fmdeploy.com/v2/barcode/standard2of5?label=true&text=" & GetAsURLEncoded ( Items::Code ) ; cURL options: "--header \"Authorization: Bearer " & $$BARCODE_KEY & "\"" ]
What it accepts
Digits only, any length. Example: 1234567
If the text can’t be encoded, the API answers with a clear message instead of a broken image.
Options
Set the bar width with scale, the bar height with thickness, and turn the text under the bars on with label. You can also choose the label font and size, rotate the image in quarter turns, set the DPI stored in a PNG, or ask for SVG. The documentation lists every parameter and its default.
Related formats
Try Standard 2 of 5 with a free key
200 barcodes free every month. No card needed.