add coupon amount to order->info via ot_coupon class

[proseLA]

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[proseLA]

i'm hopeful that we can include the coupon amount somewhere in the order object. and specifically here in the info array.

we are already subtracting the amount from the order total, but not the subtotal. we are then potentially doing some tax calculations in the coupon class, that involve this amount.

it seems that we have all of these order total modules that potentially populate valuable info into the order->info array. in my troubleshooting for taxes and math correctly summing up, everything always comes back to this array.

adding it as an extra element here seems like low cost as opposed to forcing more database hits later for those stores that need this amount for their tax calculations and to ensure correct order totals.

[proseLA]

https://www.zen-cart.com/showthread.php?200407-Edit-Orders-v4-0-Support-Thread&p=1380563#post1380563

perhaps, it is time to rethink the order total module? it does nothing other than spit out what is in the order->info array. and needless to say it is very easy for the math to go wrong. why are we keeping a running total as opposed to recalculating the total provide by all of the active order_total modules? apologies if this is thread drift, but it seems related.