Why your USA service ZIP code matters at checkout
Learn why Aelixar validates the service ZIP code before calculating tax and creating the final order.
4 minute read · Updated 2026-07-31Mobile taxes depend on service location
USA telecommunications taxes can vary by jurisdiction. Aelixar therefore calculates tax only after a valid five-digit service ZIP code has resolved to a canonical city and state.
The location step occurs before customer details and payment review.
- Five-digit ZIP
- Resolved city and state
- Location-based tax
Use the service address, not a guess
Enter the address associated with the mobile service. A physical SIM can still have a different delivery address.
The server revalidates the ZIP during order creation so altered browser values cannot bypass the location check.
- Service street address
- Separate delivery address
- Server-side revalidation
Payment is blocked if tax cannot be confirmed
The final cost, tax, and total must be available before payment. If the tax service is temporarily unavailable, the entered data remains available for review and retry.
No Stripe Checkout Session should be created until the order total is valid.
- Review ZIP and address
- Retry without re-entering everything
- Final total before Stripe