curl --request GET \
--url https://api.flow.engineer/v1/conversations/{conversation_id}/messages \
--header 'Authorization: Bearer <token>'const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.flow.engineer/v1/conversations/{conversation_id}/messages', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.flow.engineer/v1/conversations/{conversation_id}/messages"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.flow.engineer/v1/conversations/{conversation_id}/messages"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}{
"data": [
{
"id": "msg_01JB8ZD4M6P8R0T2V4X6Z8B0C2",
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"direction": "in",
"status": "received",
"content": {
"type": "text",
"text": "<string>",
"format": "plain"
},
"livemode": true,
"created_at": "2023-11-07T05:31:56Z",
"delivered_as": {
"type": "text",
"reason": "<string>"
},
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
},
"channel_message_id": "<string>",
"reply_to": "msg_01JB8ZD4M6P8R0T2V4X6Z8B0C2",
"metadata": {},
"updated_at": "2023-11-07T05:31:56Z"
}
],
"has_more": true
}{
"error": {
"type": "invalid_request",
"message": "limit must be between 1 and 100.",
"hint": "Pass limit between 1 and 100 (default 20), and page with after or before.",
"doc_url": "https://api.flow.engineer/docs/errors/invalid_request",
"param": "limit"
}
}{
"error": {
"type": "authentication",
"message": "No valid API key was given.",
"hint": "Send the header Authorization: Bearer fk_test_... (or fk_live_...); no key yet? Get a test key with curl -X POST https://api.flow.engineer/v1/sandbox/keys",
"doc_url": "https://api.flow.engineer/docs/errors/authentication"
}
}{
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
}
}{
"error": {
"type": "new_contact_limit",
"message": "This sender has started its 15 new conversations for today.",
"hint": "Retry after 3600 seconds; replies into existing conversations still go.",
"doc_url": "https://api.flow.engineer/docs/errors/new_contact_limit",
"retry_after": 3600,
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T"
}
}{
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
}
}List a conversation's messages
Lists the messages in a conversation, inbound and outbound, newest first. Message content is kept for your plan’s retention period (30 days by default); older messages are not returned.
curl --request GET \
--url https://api.flow.engineer/v1/conversations/{conversation_id}/messages \
--header 'Authorization: Bearer <token>'const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.flow.engineer/v1/conversations/{conversation_id}/messages', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.flow.engineer/v1/conversations/{conversation_id}/messages"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.flow.engineer/v1/conversations/{conversation_id}/messages"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}{
"data": [
{
"id": "msg_01JB8ZD4M6P8R0T2V4X6Z8B0C2",
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"direction": "in",
"status": "received",
"content": {
"type": "text",
"text": "<string>",
"format": "plain"
},
"livemode": true,
"created_at": "2023-11-07T05:31:56Z",
"delivered_as": {
"type": "text",
"reason": "<string>"
},
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
},
"channel_message_id": "<string>",
"reply_to": "msg_01JB8ZD4M6P8R0T2V4X6Z8B0C2",
"metadata": {},
"updated_at": "2023-11-07T05:31:56Z"
}
],
"has_more": true
}{
"error": {
"type": "invalid_request",
"message": "limit must be between 1 and 100.",
"hint": "Pass limit between 1 and 100 (default 20), and page with after or before.",
"doc_url": "https://api.flow.engineer/docs/errors/invalid_request",
"param": "limit"
}
}{
"error": {
"type": "authentication",
"message": "No valid API key was given.",
"hint": "Send the header Authorization: Bearer fk_test_... (or fk_live_...); no key yet? Get a test key with curl -X POST https://api.flow.engineer/v1/sandbox/keys",
"doc_url": "https://api.flow.engineer/docs/errors/authentication"
}
}{
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
}
}{
"error": {
"type": "new_contact_limit",
"message": "This sender has started its 15 new conversations for today.",
"hint": "Retry after 3600 seconds; replies into existing conversations still go.",
"doc_url": "https://api.flow.engineer/docs/errors/new_contact_limit",
"retry_after": 3600,
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T"
}
}{
"error": {
"type": "invalid_request",
"message": "<string>",
"hint": "Send a template instead: POST /v1/messages with content.type=template.",
"doc_url": "https://api.flow.engineer/docs/errors/outside_window",
"param": "<string>",
"retry_after": 1,
"conversation": "conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1",
"sender": "snd_01JB8Z4Q3V6W0R2N7C5H1M9K4T",
"channel_code": "<string>",
"request_id": "<string>"
}
}Authorizations
An API key of one app, sent as Authorization: Bearer <key>. Keys start with
fk_test_ (test mode: sandbox senders and test data only) or fk_live_
(live mode). Keep live keys on your server; never ship them in an app or page.
Headers
The API version to use, as a date. Without it, the version pinned to your app when it was created is used.
"2026-11-01"
Path Parameters
The conversation's ID.
A conversation ID, conv_ and a ULID.
^conv_[0-9A-HJKMNP-TV-Z]{26}$"conv_01JB8ZC3K5M7P9R1T3V5X7Z9B1"
Query Parameters
An item ID. Returns the items that come after it in the list's order.
64An item ID. Returns the items that come before it in the list's order.
64How many items to return, 1 to 100.
1 <= x <= 100