One of my children also received this-here's the info on ours-the Promo code at the bottom of ours is MPF219-the link appears to be the same as the one posted earlier
• 40,000 bonus miles after your first $250 in purchases
• 5,000 EQM after your first purchase
• 5,000 EQM maximum each year from purchases at united.com2
• 5,000 EQM after $35,000 in purchases each year
• 2 miles per $1 spent on United® and Star Alliance® purchases
• 2 miles per $1 spent on groceries, dining, gas at the pump, and home improvement purchases
• 1 mile per $1 spent on all other purchases