Code39 and Code128 are alphanumeric barcode standards that are said to be the most widely used in the world.
Code39 and Code128 are representatives of the so called 1-D barcodes. They use linear pattern for encoding data – black bars and white spaces. A simple example of these two types consists of two main sections – machinery-readable information and human-readable text.
When numbering your gift card, remember the numbers have to be up to 19 digits. Also, request random numbers in a range, as opposed to sequential. For example:
You have thousand of potencial batches without ever recieving a card with the same number as a previous batch, while also not recieving sequential numbers.