Event catalogue
Inbound system message
Meta system notices arrive as type: "system". This one says the customer moved to a new number; system.wa_id is the new id.
Meta system notices arrive as type: "system". This one says the customer moved to a new number; system.wa_id is the new id.
Event type: message.inbound. Fixture payloads are the WhaBuzz Demo tenant's real ids with a fictional customer number; id, tenant_id and created_at in envelopes are illustrative.
#Customer changed their number
What Meta POSTs to WhaBuzz (fixtures/meta/system_user_changed_number.json):
{
"object": "whatsapp_business_account",
"entry": [
{
"id": "26059971920328384",
"changes": [
{
"value": {
"messaging_product": "whatsapp",
"metadata": {
"display_phone_number": "14692311132",
"phone_number_id": "1013622581841046"
},
"contacts": [
{
"profile": {
"name": "Kerry Fisher"
},
"wa_id": "16505551234",
"user_id": "US.13491208655302741918"
}
],
"messages": [
{
"from": "16505551234",
"id": "wamid.HBgLMTY1MDU1NTEyMzQVAgASGBQzQUY5QTdGNkU0RTFGMkI3QzFB19AA=",
"timestamp": "1760591523",
"type": "system",
"system": {
"body": "User A changed from 16505551234 to 16505559999",
"wa_id": "16505559999",
"type": "user_changed_number"
}
}
]
},
"field": "messages"
}
]
}
]
}What your endpoint receives, as the body of a signed POST. raw is abbreviated here; on the wire it is the full body above.
{
"id": "evt_01JAB3K9X2S8C4M7Q1V5R6T0YZ",
"type": "message.inbound",
"api_version": "2026-10-16",
"created_at": "2025-10-16T05:12:03.481Z",
"tenant_id": "a578246e-b97f-48e6-ae42-939ec3ccf917",
"waba_id": "26059971920328384",
"phone_number_id": "1013622581841046",
"display_phone_number": "14692311132",
"wamid": "wamid.HBgLMTY1MDU1NTEyMzQVAgASGBQzQUY5QTdGNkU0RTFGMkI3QzFB19AA=",
"wa_id": "16505551234",
"user_id": "US.13491208655302741918",
"dedupe_key": "msg:wamid.HBgLMTY1MDU1NTEyMzQVAgASGBQzQUY5QTdGNkU0RTFGMkI3QzFB19AA=",
"data": {
"messaging_product": "whatsapp",
"metadata": {
"display_phone_number": "14692311132",
"phone_number_id": "1013622581841046"
},
"contacts": [
{
"profile": {
"name": "Kerry Fisher"
},
"wa_id": "16505551234",
"user_id": "US.13491208655302741918"
}
],
"message": {
"from": "16505551234",
"id": "wamid.HBgLMTY1MDU1NTEyMzQVAgASGBQzQUY5QTdGNkU0RTFGMkI3QzFB19AA=",
"timestamp": "1760591523",
"type": "system",
"system": {
"body": "User A changed from 16505551234 to 16505559999",
"wa_id": "16505559999",
"type": "user_changed_number"
}
}
},
"raw": {
"…": "the complete Meta POST body, byte for byte, as shown above"
},
"raw_path": "entry[0].changes[0].value.messages[0]"
}This page as Markdown: /events/inbound-system.md. All docs in one file: /llms-full.txt.