Verify and register beverage alcohol shipments with the AvaTax shipping verification API

Steps

1. After creating a Sales Invoice transaction in AvaTax, call GET /api/v2/companies/{companyCode}/transactions/{transactionCode}/shipment/verify to check compliance for that transaction.
2. Read the response's `compliant` boolean; if true, `successMessages` explains which jurisdiction rules passed (e.g. valid license, age checks, volume limits).
3. If `compliant` is false, inspect `failureMessages` (and per-line `failureMessages`) to identify exactly which part of the transaction violated a jurisdiction's rules.
4. Note that VerifyShipment only checks compliance — it does not record shipped volume; call the RegisterShipment endpoint separately to commit the volume, or use RegisterShipmentIfCompliant to verify and register in one call.
5. When verifying shipments for a Return Invoice, include `documentType=ReturnInvoice` in the request URL — omitting it causes a 'Document not found' error because the API defaults to SalesInvoice.
6. Use the DeleteShipmentRegistration endpoint to undo a registration if an order is later canceled or voided.