Store - Discount applied in checkout form, but not on final order

Question

I've run into an unexpected issue with manual payments: when checking out, discounts are successfully applied on the front-end (discount amount is returned and total amount updates accordingly) but when viewing the order in the Store admin the discount is missing from the order (i.e. displays $0.00).

This does not happen for credit card orders (processed through Stripe).

A note on my checkout process. I'm using Switchee to check the member group. If the member is in our commercial member group they're presented with a manual payment form so that we can process the order and invoice for the payment.

I'm at a loss for what may be happening during the payment processing that would drop the discount. To be sure there are no conflicts, I disabled the two extensions that I use in conjunction with Store (one hooks into store_order_taxes and the other store_order_complete_end), but still no luck.

Has anyone encountered this, or something similar?

Thanks in advance for any insights.

EE 2.7.3
Store 2.2.0

Answer 1

I believe the problem here was that after allowing the user to enter a promo_code, the promo_code field was redisplayed empty.

That way, when the customer submitted the final order for payment, the promo code was reset to a blank string, resulting in the discount being removed.

To avoid this, either hide the promo_code field when it is set, or display a field with the current value:

<input type="text" name="promo_code" value="{promo_code}" />

or

{field:promo_code}