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El Salvador: from November 3 you can migrate to electronic invoicing v2; the tax authority (Hacienda) set December 1, 2026 as the deadline to start. First request the tests at factura.gob.sv and complete them before going to production. See the migration guide · External API: migrate to /external/v2 before March 30, 2027; on January 1, 2027 the unversioned /external routes are removed. See versioning