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872a9451c0
Use WooCommerce's get_total() as the authoritative order amount instead of deriving it from breakdown components. When the two values differ by a rounding delta (typically ±1 cent from inclusive-tax calculations), absorb the difference into the tax breakdown component so PayPal's invariant — amount.value === sum(breakdown) — continues to hold. Without this fix, PayPal would capture a component-derived total that could differ from the WooCommerce order total by one cent, causing full refunds to be rejected with REFUND_AMOUNT_EXCEEDED. Add regression tests covering: - Zero delta (components already match get_total) - ±1 cent delta (the inclusive-tax rounding case) - Parametrised invariant suite across discounts and fees |
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