Summary

When a customer selects in-person pickup and edits their billing address (even just deleting and re-typing a digit), the tax calculation was using the wrong address, resulting in incorrect tax amounts.

#Root cause
Root Cause: Inuse-update-order.ts, when the billing address was updated, updateTaxes.mutate() was called with undefined, causing the backend to use the customer's billing address instead of the pickup location address for tax calculation.

Example of the bug:

Pickup location zipcode: 30143 (7% tax rate)
Customer billing zipcode: 30734 (8% tax rate)
First calculation: Correctly uses pickup location → 7% ✅
After editing billing address: Uses customer address → 8% ❌ (now fixed)
Related ticket: https://godaddy-corp.atlassian.net/browse/CIEC-11081

Changeset

• Changeset added (docs)

Test Plan

Test Plan
Unit Tests (9 new tests):

✅ Returns pickup location address for PICKUP delivery method
✅ Returns correct location when multiple locations exist
✅ Returns undefined if pickup location not found
✅ Returns undefined if locations array is empty
✅ Returns undefined if locations is undefined
✅ Returns undefined for SHIP delivery method
✅ Returns undefined when delivery method is undefined
✅ Handles pickupLocationId being undefined for pickup
✅ Handles empty string pickupLocationId for pickup