Mexico's mandatory electronic invoice, stamped by a SAT-authorised provider using the seller's own digital seal certificate.
Mexico's mandatory electronic invoice, stamped by a SAT-authorised provider using the seller's own digital seal certificate.
Without one the buyer cannot deduct the purchase or credit the IVA, which turns your invoice into a cost for them. GRAJ cannot issue one — stamping needs your private key — so it has to come from your PAC or your accountant.
Every term here is one the protocol actually uses, defined for somebody who was never taught it — with the part that usually goes wrong. All terms →