Sites
Get a sign-in handoff for a site
A single-use handoff that signs the member in on their company’s storefront, for an app that holds the member’s token and opens one of the company’s member sites in a browser session of its own, such as Mist’s site preview. The app sends a random continuity secret it keeps, redeems the handoff once at redeem_url (see that field), then opens site_url. The handoff expires about a minute after it is made and is never put in a URL. The response is never cached (Cache-Control: private, no-store).
For a company that signs in through the identity service, only with a person’s identity access token (a rep or an admin) for this member; anything else answers 403 identity_session_required. For a company that does not, only with a token the storefront’s own sign-in would accept for this member (the one fluid-login hands back), and not one minted to act for them (a cloud run’s login, an on-behalf or read-only token); anything else answers 403 unauthorized. Bearer only: the cookie mount is refused with 403. It answers 404 while member sites or the member storefront are off for the member’s company, and for a site the member may not view.
POST
/
api
/
member
/
v2026-10
/
sites
/
{site_id}
/
sign-in-handoffs
Get a sign-in handoff for a site
curl --request POST \
--url https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"continuity": "4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b"
}
'import requests
url = "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs"
payload = { "continuity": "4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({continuity: '4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b'})
};
fetch('https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'continuity' => '4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs"
payload := strings.NewReader("{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}"
response = http.request(request)
puts response.read_body{
"status": 201,
"data": {
"handoff": "9pQe3LkZ2bW7xR4tYc8vN1mH",
"redeem_url": "https://shop.example.com/auth/redeem",
"site_url": "https://shop.example.com/sites/align-picks",
"expires_at": "2026-11-10T10:01:00.000Z"
},
"meta": {
"request_uuid": "0192f4c8-5b6c-7d74-a3e8-0f1a2b3c4d5e",
"timestamp": "2026-11-10T10:00:00Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}Authorizations
A member credential in the Authorization: Bearer header: a member
session JWT, a portal JWT whose login is linked to a membership in
that company, an opaque member token, or a verified One Auth identity
access token. The credential alone identifies the member and company.
Member session JWTs, and portal JWTs the server minted read-only, are
refused with 403 on every write.
Path Parameters
Public id of one of the member's sites.
Body
application/json
What a sign-in handoff request carries.
A random secret the app generates for this handoff and keeps. Only its digest is stored; the app sends it again in the redeem's body. Treat it as a secret.
Required string length:
32 - 128Response
The handoff.
The sign-in handoff for a site.
⌘I
Get a sign-in handoff for a site
curl --request POST \
--url https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"continuity": "4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b"
}
'import requests
url = "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs"
payload = { "continuity": "4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({continuity: '4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b'})
};
fetch('https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'continuity' => '4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs"
payload := strings.NewReader("{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.fluid.app/api/member/v2026-10/sites/{site_id}/sign-in-handoffs")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"continuity\": \"4b3f0d0e8b2a4c5f9e1d7a6b3c2f1e0d9a8b7c6d5e4f3a2b\"\n}"
response = http.request(request)
puts response.read_body{
"status": 201,
"data": {
"handoff": "9pQe3LkZ2bW7xR4tYc8vN1mH",
"redeem_url": "https://shop.example.com/auth/redeem",
"site_url": "https://shop.example.com/sites/align-picks",
"expires_at": "2026-11-10T10:01:00.000Z"
},
"meta": {
"request_uuid": "0192f4c8-5b6c-7d74-a3e8-0f1a2b3c4d5e",
"timestamp": "2026-11-10T10:00:00Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"status": 123,
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"timestamp": "2023-11-07T05:31:56Z"
}
}