The Wallet application displays Aztec, PDF417 and QR Code barcodes and Code 128 1D barcodes beginning with iOS 9.

Displays 2D barcodes of following types: Aztec, PDF417 and QR Code.

barcode_aztec Figure 1 - Aztec (Example from Wikipedia)

barcode_pdf417 Figure 2 - PDF417 (Example from Wikipedia)

barcode_qrcode Figure 3 - QR Code (Example from Wikipedia)

Displays 1D barcodes of following types: Code 128 beginning with iOS 9.

barcode_code128 Figure 3 - Code 128