How to provide ubercart discount coupons only for specific users Anyone can say how to provide ubercart discount coupons only for applicable users and not for the other users ?. For example if a user from texas, then the admin can provide a coupon code only for that texas user and  it should not applicable for other out of texas users . please reply ASAP if anyone knows . thanks.
What you are looking for is a custom hook_uc_validate_coupon function. Ubercart coupon module allows for custom hooks here:

// Invoke validation hook.
  foreach (module_implements('uc_coupon_validate') as $module) {
    $callback = $module . '_uc_coupon_validate';
    $result = $callback($coupon, $order, $account);


So in your site module you would need to define a new hook function that validates whether the order (or possibly the user object?) is using a billing address from Texas. Roughly, clone the existing validation function and add logic to check the order for your conditions.

function YOURMODULE_uc_coupon_validate($code, $order = NULL, $account = NULL) {

if ($order-&gt;billing_state != 'Texas') { // or however you want to handle this
   $coupon = new stdClass();
   $coupon-&gt;valid = FALSE;
   $coupon-&gt;message = t('This coupon code is only valid in Texas.');
   $coupon-&gt;title = t('Unknown');
   return $coupon;
}

.. rest of validation function


}