Get the callback (public reader visitor OIDC)
GET
https://forumulate.com/api /public/visitor-oidc/callback The single redirect URI a customer registers with their reader identity provider; the space travels in signed state. Exchanges the code, provisions the member when accounts are on, sets the reader pass and returns them to returnTo — via the adopt ticket when that is another domain.
Parameters
statestringquerycodestringqueryforumulate-versionstringheaderAPI version negotiation. Send
forumulate-version: 2026-12-01 on every request from a new integration; it is optional only so that integrations written before versioning keep working. Each version includes everything before it:Code samples
cURL
curl -X GET "https://forumulate.com/api/public/visitor-oidc/callback?state=&code=" \
-H "forumulate-version: <value>"TypeScript
const res = await fetch('https://forumulate.com/api/public/visitor-oidc/callback?state=&code=', {
method: 'GET',
headers: {
'forumulate-version': '<value>',
},
});
const data = await res.json();Python
import requests
res = requests.request(
"GET",
"https://forumulate.com/api/public/visitor-oidc/callback?state=&code=",
headers={
"forumulate-version": "<value>",
},
)
data = res.json()Go
package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, _ := http.NewRequest("GET", "https://forumulate.com/api/public/visitor-oidc/callback?state=&code=", nil)
req.Header.Set("forumulate-version", "<value>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}PHP
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://forumulate.com/api/public/visitor-oidc/callback?state=&code=');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ['forumulate-version: <value>']);
$response = curl_exec($ch);
curl_close($ch);
echo $response;Ruby
require 'net/http'
require 'uri'
uri = URI('https://forumulate.com/api/public/visitor-oidc/callback?state=&code=')
req = Net::HTTP::Get.new(uri)
req['forumulate-version'] = '<value>'
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https') do |http|
http.request(req)
end
puts res.bodyJava
import java.net.URI;
import java.net.http.*;
import java.net.http.HttpRequest.BodyPublishers;
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://forumulate.com/api/public/visitor-oidc/callback?state=&code="))
.header("forumulate-version", "<value>")
.GET()
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());Responses
302 The provider’s answer, verified; the reader session is set.
400 The provider came back without a
code or a state."string"
429 Rate limited — see the RateLimit-* headers.
Example
{
"error": {
"code": "string",
"message": "string",
"details": {},
"docs": "string",
"reason": "string",
"slugs": [
"string"
],
"conflict": {
"etag": "string",
"ops": [
null
]
}
},
"requestId": "string"
}Schema
errorobjectrequiredShow child parameters
codestringrequiredStable, machine-readable error code, e.g.
rbac.forbidden.messagestringrequiredHuman-readable explanation.
detailsobjectField-level validation problems, keyed by field path (422 only).
docsstringWhere the vocabulary or format this error is about is published — an absolute URL, or an API route such as
GET /space-types/{type}/presets. Present on errors over a controlled list, so the answer to "what am I allowed to send?" is in the error itself.reasonstringWhy a credential was refused, as one stable word, where one status has several causes — e.g. an external_jwt redeem answers
iat_too_old, iat_in_future, bad_signature, bad_issuer, bad_audience, expired and more. Branch on this, not on message.slugsstring[]The exact slugs that collided, on a slug-conflict 409 —
space.slug_taken, page.slug_taken, collection.slug_taken, site.slug_taken or badge.slug_taken.conflictobjectOn a 409 from a content entry field write (
PATCH …/entries/{entryId}/fields) whose If-Match was stale.Show child parameters
etagstringrequiredThe entry's current fields etag.
opsarrayrequiredThe field operations since your
If-Match that touch a path your own operations touch. Empty: none did — retry the batch unchanged under etag. null: the history no longer reaches your tag — re-read the entry first.requestIdstringThe id of this request — the same value as the
x-request-id and x-forumulate-request-id response headers. Quote it in a bug report: it is the only thing that finds your exact request in our logs. It is in the body because that is the part that survives — an SDK that throws the parsed body, a serverless log that keeps the body and drops the headers, a ticket with the JSON pasted in.default Error — the stable { error: { code, message } } envelope.
Example
{
"error": {
"code": "string",
"message": "string",
"details": {},
"docs": "string",
"reason": "string",
"slugs": [
"string"
],
"conflict": {
"etag": "string",
"ops": [
null
]
}
},
"requestId": "string"
}Schema
errorobjectrequiredShow child parameters
codestringrequiredStable, machine-readable error code, e.g.
rbac.forbidden.messagestringrequiredHuman-readable explanation.
detailsobjectField-level validation problems, keyed by field path (422 only).
docsstringWhere the vocabulary or format this error is about is published — an absolute URL, or an API route such as
GET /space-types/{type}/presets. Present on errors over a controlled list, so the answer to "what am I allowed to send?" is in the error itself.reasonstringWhy a credential was refused, as one stable word, where one status has several causes — e.g. an external_jwt redeem answers
iat_too_old, iat_in_future, bad_signature, bad_issuer, bad_audience, expired and more. Branch on this, not on message.slugsstring[]The exact slugs that collided, on a slug-conflict 409 —
space.slug_taken, page.slug_taken, collection.slug_taken, site.slug_taken or badge.slug_taken.conflictobjectOn a 409 from a content entry field write (
PATCH …/entries/{entryId}/fields) whose If-Match was stale.Show child parameters
etagstringrequiredThe entry's current fields etag.
opsarrayrequiredThe field operations since your
If-Match that touch a path your own operations touch. Empty: none did — retry the batch unchanged under etag. null: the history no longer reaches your tag — re-read the entry first.requestIdstringThe id of this request — the same value as the
x-request-id and x-forumulate-request-id response headers. Quote it in a bug report: it is the only thing that finds your exact request in our logs. It is in the body because that is the part that survives — an SDK that throws the parsed body, a serverless log that keeps the body and drops the headers, a ticket with the JSON pasted in.The Forumulate teamUpdated