Point of Sale now automatically validates an order when the payment amount exactly matches the order total. This reduces an extra step for cashiers and helps speed up checkout while avoiding validation when payments do not fully match.

Only when the total payment is exactly the order's total price.

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POS orders connected through IoT are now covered by tests to ensure they are automatically validated once an electronic payment fully covers the amount due. This helps streamline checkout and reduces the chance of staff needing extra manual steps after payment.

Unfortunately, we need to write the test here in pos_iot for the feature
to automatically validate an order when it's fully paid after an
electronic payment.