Employment Verification

Hello! I recently visited an ATT store and purchased a new phone. During my visit, an employee mentioned that I could receive a monthly discount based on who my employer is. He noted that I would have to provide proof of employment online with a paystub, but unfortunately, I did not receive more detailed directions. Despite searching the ATT site and my profile portal, I have not found a place to submit this information. Can you please guide me in the right direction? Thank you!