You can insert into the coupon design also QR codes, which can be later read by a code reader to make their input easier. QR codes are automatically generated by Post Affiliate Pro and each QR code matches a coupon id.
You can add QR codes to a coupon by editing the coupon Design and using the variable {$qrcodeimage} :
Then your affiliates will be able to see and print QR codes in section with promotion materials: