curl --request PUT \
--url https://your-site.com/{basePath}/seo \
--header 'Content-Type: application/json' \
--header 'X-API-Key: <api-key>' \
--header 'X-Castro-Signature: <api-key>' \
--header 'X-Castro-Timestamp: <api-key>' \
--data '
{
"seo": {
"title": "<string>",
"description": "<string>",
"keywords": [
"<string>"
]
},
"id": "<string>",
"url": "https://your-site.com/shoes/trail-runner-x",
"slug": "trail-runner-x"
}
'import requests
url = "https://your-site.com/{basePath}/seo"
payload = {
"seo": {
"title": "<string>",
"description": "<string>",
"keywords": ["<string>"]
},
"id": "<string>",
"url": "https://your-site.com/shoes/trail-runner-x",
"slug": "trail-runner-x"
}
headers = {
"X-API-Key": "<api-key>",
"X-Castro-Timestamp": "<api-key>",
"X-Castro-Signature": "<api-key>",
"Content-Type": "application/json"
}
response = requests.put(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'PUT',
headers: {
'X-API-Key': '<api-key>',
'X-Castro-Timestamp': '<api-key>',
'X-Castro-Signature': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
seo: {title: '<string>', description: '<string>', keywords: ['<string>']},
id: '<string>',
url: 'https://your-site.com/shoes/trail-runner-x',
slug: 'trail-runner-x'
})
};
fetch('https://your-site.com/{basePath}/seo', 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://your-site.com/{basePath}/seo",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => json_encode([
'seo' => [
'title' => '<string>',
'description' => '<string>',
'keywords' => [
'<string>'
]
],
'id' => '<string>',
'url' => 'https://your-site.com/shoes/trail-runner-x',
'slug' => 'trail-runner-x'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-API-Key: <api-key>",
"X-Castro-Signature: <api-key>",
"X-Castro-Timestamp: <api-key>"
],
]);
$response = curl_exec($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://your-site.com/{basePath}/seo"
payload := strings.NewReader("{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}")
req, _ := http.NewRequest("PUT", url, payload)
req.Header.Add("X-API-Key", "<api-key>")
req.Header.Add("X-Castro-Timestamp", "<api-key>")
req.Header.Add("X-Castro-Signature", "<api-key>")
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.put("https://your-site.com/{basePath}/seo")
.header("X-API-Key", "<api-key>")
.header("X-Castro-Timestamp", "<api-key>")
.header("X-Castro-Signature", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://your-site.com/{basePath}/seo")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Put.new(url)
request["X-API-Key"] = '<api-key>'
request["X-Castro-Timestamp"] = '<api-key>'
request["X-Castro-Signature"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}"
response = http.request(request)
puts response.read_bodyUpdate SEO metadata only
Update ONLY the SEO block of an entity — nothing else changes. The
target is identified by id (the id you returned at create time),
url (the live page URL) or slug; resolve whichever you receive.
curl --request PUT \
--url https://your-site.com/{basePath}/seo \
--header 'Content-Type: application/json' \
--header 'X-API-Key: <api-key>' \
--header 'X-Castro-Signature: <api-key>' \
--header 'X-Castro-Timestamp: <api-key>' \
--data '
{
"seo": {
"title": "<string>",
"description": "<string>",
"keywords": [
"<string>"
]
},
"id": "<string>",
"url": "https://your-site.com/shoes/trail-runner-x",
"slug": "trail-runner-x"
}
'import requests
url = "https://your-site.com/{basePath}/seo"
payload = {
"seo": {
"title": "<string>",
"description": "<string>",
"keywords": ["<string>"]
},
"id": "<string>",
"url": "https://your-site.com/shoes/trail-runner-x",
"slug": "trail-runner-x"
}
headers = {
"X-API-Key": "<api-key>",
"X-Castro-Timestamp": "<api-key>",
"X-Castro-Signature": "<api-key>",
"Content-Type": "application/json"
}
response = requests.put(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'PUT',
headers: {
'X-API-Key': '<api-key>',
'X-Castro-Timestamp': '<api-key>',
'X-Castro-Signature': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
seo: {title: '<string>', description: '<string>', keywords: ['<string>']},
id: '<string>',
url: 'https://your-site.com/shoes/trail-runner-x',
slug: 'trail-runner-x'
})
};
fetch('https://your-site.com/{basePath}/seo', 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://your-site.com/{basePath}/seo",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => json_encode([
'seo' => [
'title' => '<string>',
'description' => '<string>',
'keywords' => [
'<string>'
]
],
'id' => '<string>',
'url' => 'https://your-site.com/shoes/trail-runner-x',
'slug' => 'trail-runner-x'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-API-Key: <api-key>",
"X-Castro-Signature: <api-key>",
"X-Castro-Timestamp: <api-key>"
],
]);
$response = curl_exec($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://your-site.com/{basePath}/seo"
payload := strings.NewReader("{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}")
req, _ := http.NewRequest("PUT", url, payload)
req.Header.Add("X-API-Key", "<api-key>")
req.Header.Add("X-Castro-Timestamp", "<api-key>")
req.Header.Add("X-Castro-Signature", "<api-key>")
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.put("https://your-site.com/{basePath}/seo")
.header("X-API-Key", "<api-key>")
.header("X-Castro-Timestamp", "<api-key>")
.header("X-Castro-Signature", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://your-site.com/{basePath}/seo")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Put.new(url)
request["X-API-Key"] = '<api-key>'
request["X-Castro-Timestamp"] = '<api-key>'
request["X-Castro-Signature"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"seo\": {\n \"title\": \"<string>\",\n \"description\": \"<string>\",\n \"keywords\": [\n \"<string>\"\n ]\n },\n \"id\": \"<string>\",\n \"url\": \"https://your-site.com/shoes/trail-runner-x\",\n \"slug\": \"trail-runner-x\"\n}"
response = http.request(request)
puts response.read_bodyAuthorizations
The connection key the user generated in Jorge Castro (Settings → Integration → Custom Website). Reject any request whose key doesn't match yours.
Unix time in milliseconds when the request was signed — Castro uses
Date.now(). Reject anything more than a few minutes old.
A seconds-based comparison makes every request look ~55,000 years in the future, and the freshness check then silently passes everything.
HMAC-SHA256("{timestamp}.{rawBody}", api_key), lowercase hex.
rawBody is the exact bytes of the request body — empty for GET
and DELETE, which therefore sign over "{timestamp}.". Hash the raw
bytes, never a re-serialized copy of the parsed JSON: whitespace and key
order differences will break the comparison for some payloads and not
others, which reads as an intermittent bug.
Compare in constant time (crypto.timingSafeEqual, hash_equals,
hmac.compare_digest).
Body
Response
SEO updated

