{"standard":"FACTURA-SV Fiscal Identity Standard","version":"1.0","prefix":"FSV1:","encoding":"base64url(JSON-UTF8)","encryption":"none (open standard)","country":"SV (El Salvador)","authority":"Ministerio de Hacienda","fields":{"v":{"type":"int","required":true,"description":"Format version (always 1)"},"tipo_doc":{"type":"string","required":true,"values":{"36":"NIT","13":"DUI","37":"Pasaporte","03":"Carnet Residente"}},"nit":{"type":"string","required":true,"description":"Tax ID, digits only (14 for NIT, 9 for DUI)"},"nrc":{"type":"string","required":false,"description":"Tax registration number (contribuyentes only)"},"nombre":{"type":"string","required":true,"description":"Full legal name or business name"},"nombre_comercial":{"type":"string","required":false},"cod_actividad":{"type":"string","required":false,"description":"Economic activity code (CAT-019 MH)"},"desc_actividad":{"type":"string","required":false},"depto":{"type":"string","required":false,"description":"Department code (01-14, CAT-012 MH)"},"muni":{"type":"string","required":false,"description":"Municipality code (CAT-013 MH)"},"dir":{"type":"string","required":false,"description":"Street address"},"tel":{"type":"string","required":false},"email":{"type":"string","required":false}},"how_to_decode":["1. Strip prefix 'FSV1:'","2. Base64url decode the remainder","3. Parse as UTF-8 JSON","4. Validate required fields: v, tipo_doc, nit, nombre"],"how_to_generate":["1. Build JSON object with required + optional fields","2. Minify JSON (no whitespace)","3. Base64url encode","4. Prepend 'FSV1:'","5. Generate QR code from the resulting string"],"compatibility":"Any QR reader + base64 decoder can read this format","generator":"https://factura-sv.algoritmos.io/mi-tarjeta-fiscal","api_lookup":"GET /api/v1/fiscal-id/lookup?nit={nit}","license":"Open standard — free to implement without license"}