External references for acknowledgements

When you retrieve the status of a delivered message and includeAck is set to true, the response contains two kinds of evidence from the government platform that processed your e‑invoice:

A Base64‑encoded acknowledgement payload
External reference identifiers issued by that platform

External references vary by country and by channel (for example, Peppol). The following table lists reference types per country and provides example values to help you validate integrations and map identifiers in downstream systems.

Country	Name	Example	Notes
Belgium Croatia Denmark Germany Great Britain Finland France Netherlands Norway Sweden	`PEPPOL_DOCUMENT_ID`	`b0b1aa65-5a7f-4ad9-91fc-32113956c362`	Peppol only.
	`PEPPOL_MESSAGE_ID`	`87c168db-5766-49b4-959b-29b17bfbbdae@phase4`
	`PEPPOL_CONVERSATION_ID`	`phase4@Conv-75182001978994868`
Croatia	`FISCALIZATION_ID`	`ef9629b1-5baf-489d-84b9-2a0cfcc01eb8`
Croatia	`EREPORTING_ID`	`ef9629b1-5baf-489d-84b9-2a0cfcc01eb8`
Hungary	`TRANSACTION_ID`	`4XK5UQ13WWCUGYF0`
India	`INDIA_IRP_INVOICE_REFERENCE_NUMBER`	`b1f81b60711f58bab2b6f8c33748e42f4fc5b0e9a54f16158efab0decd5c4f40`
India	`INDIA_IRP_EWAYBILL_NUMBER`	`401009745101`	Returned only when the invoice includes an e-waybill.
Italy	`SDI_ID`	`1296189`
Malaysia	`TRANSACTION_ID`	`S4TP5AP039XKC5GIZEBXWYMJ10`
	`MY_LONG_ID`	`1W0P2KWXHNMCVA5NZEBXWYMJ10jU8Bw51750498447`
	`MY_DOCUMENT_UUID`	`EQ82WPFDAYA8SH9YYD2X1MGK10`
Mexico	`TRANSACTION_ID`	`c9d4e655-40f7-4d0c-916d-5cfe50e0d86b`
Mexico	`FISCAL_FOLIO_UUID`	`499ECF05-98B8-5764-81BE-6957C263F7B9`
Poland	`KSEF_VALIDATION_URL`	`https://qr-test.ksef.mf.gov.pl/invoice/7367418952/16-10-2025/dMp5xz701nEpLtxxIkgWDLkIJmSoAruNBl5rOf3_wU4`
	`KSEF_REFERENCE_NUMBER`	`7376497127-20251124-01000030AA57-86`
	`KSEF_OFFLINE_VALIDATION_URL`	`https://qr-test.ksef.mf.gov.pl/certificate/Nip/7376497127/7376497127/1760956939278/_dALNYBPR2aBwFV1Fe33ID-pqCKEzrBDpRV6jNoAVYE/dNHxrHLg-Rxioe2TTrEFCVci3jTl2e6roz13T654pEPqmkiNznqKcC7zq3yS0wZ7F5aAdW0s4HDtBu7dlakWQh7vEcuEsMsHDHwmvNqJnPHVQ2VJHUdDmiBZmSK76YqoSmzkDRKZyfn5F2LZWJc3EVI1pyHrF6ClhNIp6qI0eYCERG-trL2CPNY7MkQ__HF6ChUwneoW24aK34XrOeyzGSXt-MDSxk51M8m9j18yahNG6plNAo37FQXSCTt2XHbmqEjO3p3DQUxjWHnyfUJNiu9qYPCwCmpy2nkbuGeq13swTdpSjMsN7wo8LUl7AfiILXFC70cPoc8cTnN_uSjglA`
	`TRANSACTION_ID`	`20260202-SB-34DF2B2000-892A95376C-8B`	Returned only for outbound invoices.
Romania	`RO_INDEX_INCARCARE`	`5020275110`	Legacy name: `RO_ID_INCARCARE`.
	`RO_ID_DESCARCARE`	`3029872782`
	`TRANSACTION_ID`	`50202751105020275110`
Spain	`TRANSACTION_ID`	`consulta_route_11110116_2025-03-02_21:20__application_response`
Taiwan	`INVOICE_NUMBER`	`CN-HZ00202024-1TNhYAAEoaaGUKD52FQghn2s5osdg`
Taiwan	`TRANSACTION_ID`	`T-3EAAEoaiWcKD6NE_gtnaJsSZrY`
Turkey	`TRANSACTION_ID`	`ce0ff0ad0-123a-11f1-81f2-8962ceb66edb`
	`TURKEY_DOCUMENT_UUID`	`c221d1f2-769f-11f1-8f21-61674680a083`
	`TURKEY_GTB_FIILI_IHRACAT_TARIHI`	`2026-06-25T00:00:00+03:00`	Returned only for e-export (e-İhracat) invoices.
	`TURKEY_GTB_GCB_TESCILNO`	`00060200EX000293`
	`TURKEY_GTB_REFNO`	`26243160110886049215327`
	`TURKEY_GTB_REFNO_TARIHI`	`2026-06-30T00:00:00+03:00`

External references for acknowledgements

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What’s Next