It's 2.25 points per dollar, I don't believe cents figure into the calculation. In your example, the only numbers that amex would consider relevant are 123 and 29
I got a call from Amex advising my limit has been reduced from 100k to 75k. Like everyone else here, the balance is paid before the due date and it generally gets around 400-800k put through it a month. All seems kind of random really.
I called them after not receiving anything for a week. They said there's a big backlog so it was manually processed (taking ~2 mins) - nothing complex in my application though so ymmv.
My main supplier has just introduced a 2.5% surcharge for amex which I doubt they would have done if the fees were at all close to V/MC (no surcharge). Dragon is going to get a massive workout from now on I suppose.
I started with the platinum card in 2011 and was upgraded to the signature after a year, keeping the same 12k limit and no fee.
I recently tried to reduce the limit back to 12k but had no luck so it would seem you can start below 15k but can't go back to it.
I probably should have elaborated.
Paypal have a known bug where if you try to add an Amex via your wallet it will, erroneously, identify it as a Mastercard.
If you use the above link it will let you add the card (as that page isn't affected by the same bug). I added my Explorer using this...
Unsurprisingly, bonus points aren't credited automatically AND they can't tell whether the promotion has ever been on your account.
Had I saved the flyer I would be inclined to post it here so everyone could have easily secured 3x points for August.