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### Summary This PR adds support for Isle of Man customers to use GB VAT tax IDs. Isle of Man uses the UK VAT system, so Orb requires country: 'GB' for validation - but the billing address country is IM. - Adds an IM VAT entry to `TAX_IDS` with a new `taxCountryIso2` override field, so the UI shows "IM VAT" while sending country: 'GB' to Orb - Introduces `getEffectiveTaxCountry()` to resolve the correct country code for Orb - Introduces `resolveStoredTaxId()` to map stored Orb data back to the correct UI entry, using billing address country to disambiguate IM vs GB - Updates all three billing forms to use these utilities: Billing Settings page, Add Payment Method modal and Update Billing Address modal ### Testing #### Automated tests I've added unit tests in this PR #### Manual tests You can use the following country/city/postal code combinations to test: - Isle of Man, Douglas, IM1 2LE - United Kingdom, Crumlin, BT29 4AA **Billing Settings page** - Select Isle of Man as billing country → tax ID dropdown shows "Isle of Man - IM VAT" - Select United Kingdom as billing country → tax ID dropdown shows "United Kingdom - UK VAT" / "United Kingdom - GB VAT" (not "IM VAT") - Select IM VAT, enter a valid GB VAT number, save → check network tab, Orb receives country: 'GB' - Reload page for an IM customer with existing tax ID → "IM VAT" is pre-selected (not "UK VAT") - Reload page for a GB customer with existing tax ID → "UK VAT" is pre-selected (no regression) - Change country from IM to GB → available tax IDs update, IM VAT no longer shown **Add Payment Method modal** - Open modal for an IM customer with existing tax ID → "IM VAT" is pre-selected - Check "I'm purchasing as a business", select Isle of Man in Stripe address → tax ID dropdown shows "IM VAT" - Check "I'm purchasing as a business", select United Kingdom in Stripe address → tax ID dropdown shows "UK VAT" / "GB VAT" - Submit with IM VAT → check network tab, tax ID is saved with country: 'GB' - Open modal for a GB customer → no regression, "UK VAT" shown as before **Update Billing Address modal** Appears for paid orgs missing a billing address - Open modal for an IM customer with existing tax ID → "IM VAT" is pre-selected - Open modal for a GB customer with existing tax ID → "UK VAT" is pre-selected - Fill in IM address + IM VAT and save → saves correctly, modal closes --------- Co-authored-by: Ignacio Dobronich <ignacio@dobronich.com>