Create a simple voucher generator

We want to integrate a voucher generator in our codeigniter website so the project should be done with codeigniter. It will have a database with the generated vouchers in the backend we should be able to see generated vouchers and ability to generate new ones. Voucher creation page should have 2 fields to fill from backend. Email and Kind of voucher. Once filled the voucher will be sent in PDF with a JPG background and an unique code on it to the email given. Another page in the backend will be to redeem vouchers. Once the code is included it will show type , code and void date. A button to cancel or to redeem. Once redeemed it will be flagged as used on database. No frontend needed or user registration . All the outputs will be integrated by us in our backend.