Sales-tax / VAT for an on-site or auto top-up. The taxable base is the credits subtotalCents (tax_behavior=exclusive →
tax added on top); the processing service fee is a pass-through, not part of the taxable sale. Located by the saved
card's billing address (preferred — works off-session) or the request IP. GRACEFUL — no location or any failure yields
{ taxCents: 0 } so a top-up always proceeds. When active, the returned calculationId is recorded via
recordTaxTransaction.
Sales-tax / VAT for an on-site or auto top-up. The taxable base is the credits
subtotalCents(tax_behavior=exclusive → tax added on top); the processing service fee is a pass-through, not part of the taxable sale. Located by the saved card's billing address (preferred — works off-session) or the request IP. GRACEFUL — no location or any failure yields{ taxCents: 0 }so a top-up always proceeds. When active, the returnedcalculationIdis recorded via recordTaxTransaction.