Is it YMMV based on agent/location on asking for proof/verification for using a AWD code? Or is there strict rules on which one they ask for?

For example, Amazon employee code (D008400) gives a great discount but it asks for corporate email address when booking. Citigroup leisure code (A074800) does not ask for corporate email address but the rates are not so great (still better than anything else except Amazon D008400). Are they both equally risky asking for proof? Or is it safe to assume citigroup wont require id?

Thanks