curl --request POST \
--url https://api.sumvin.com/v0/visa/checkout \
--header 'Content-Type: application/json' \
--header 'x-juno-jwt: <api-key>' \
--data '
{
"source": "demo"
}
'import requests
url = "https://api.sumvin.com/v0/visa/checkout"
payload = { "source": "demo" }
headers = {
"x-juno-jwt": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'x-juno-jwt': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({source: 'demo'})
};
fetch('https://api.sumvin.com/v0/visa/checkout', 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.sumvin.com/v0/visa/checkout",
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([
'source' => 'demo'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"x-juno-jwt: <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://api.sumvin.com/v0/visa/checkout"
payload := strings.NewReader("{\n \"source\": \"demo\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-juno-jwt", "<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.post("https://api.sumvin.com/v0/visa/checkout")
.header("x-juno-jwt", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"source\": \"demo\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.sumvin.com/v0/visa/checkout")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-juno-jwt"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"source\": \"demo\"\n}"
response = http.request(request)
puts response.read_body{
"_links": {},
"checkout_id": "<string>",
"status": "<string>"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}Start a checkout
Starts an agentic checkout. Pay with the built-in card (source: demo), or with a card already prepared for payment (source: card, plus its card_id). The built-in card is prepared before this call returns, so a card that cannot be prepared fails here with a 502; a card that has not yet been prepared for payment is rejected with a 409. A 409 also arises when a checkout is already in progress for the card; the two cases are told apart by the response error_code. Once started, the checkout is accepted (202) with a tracking identifier and the remaining payment steps continue asynchronously; follow the self link to track progress.
curl --request POST \
--url https://api.sumvin.com/v0/visa/checkout \
--header 'Content-Type: application/json' \
--header 'x-juno-jwt: <api-key>' \
--data '
{
"source": "demo"
}
'import requests
url = "https://api.sumvin.com/v0/visa/checkout"
payload = { "source": "demo" }
headers = {
"x-juno-jwt": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'x-juno-jwt': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({source: 'demo'})
};
fetch('https://api.sumvin.com/v0/visa/checkout', 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.sumvin.com/v0/visa/checkout",
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([
'source' => 'demo'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"x-juno-jwt: <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://api.sumvin.com/v0/visa/checkout"
payload := strings.NewReader("{\n \"source\": \"demo\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-juno-jwt", "<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.post("https://api.sumvin.com/v0/visa/checkout")
.header("x-juno-jwt", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"source\": \"demo\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.sumvin.com/v0/visa/checkout")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-juno-jwt"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"source\": \"demo\"\n}"
response = http.request(request)
puts response.read_body{
"_links": {},
"checkout_id": "<string>",
"status": "<string>"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}{
"detail": "No wallet found with ID 12345 for this user.",
"error_code": "WAL-404-001",
"instance": "/v0/wallets/12345",
"status": 404,
"title": "Wallet Not Found",
"trace_id": "abc123-def456-ghi789",
"type": "https://api.sumvin.com/errors/wal-404-001"
}Authorizations
Session JWT from the identity provider that signed the user in — Dynamic Labs, Privy, or Clerk (consumer sign-in). Send it in the x-juno-jwt header on every authenticated request. An Authorization: Bearer <jwt> header carrying the same JWT is also accepted, and takes precedence when both are present.
Headers
Tenant org ID for multi-tenant auth
Controls how timestamp fields are serialized in JSON response bodies.
Default (header omitted or any other value): epoch milliseconds as integers.
iso8601: UTC ISO 8601 strings of the form YYYY-MM-DDTHH:MM:SSZ.
Example: with X-Timestamp-Format: iso8601, the field value 1704067200000 becomes "2024-01-01T00:00:00Z".
Affected fields (recursively, in dicts and arrays): any field whose name ends in _at, plus the literal field names timestamp, period_start, and period_end. All other fields are passed through unchanged.
Only iso8601 is recognized. Any other value (or omitting the header) yields the default epoch-ms representation; the server does not reject unknown values, so this is documented as an example rather than an enum to keep generated clients permissive.
"iso8601"
Body
- DemoCheckoutSource
- CardCheckoutSource
Start a checkout using the built-in card.
"demo"Response
Card prepared; checkout accepted and continuing asynchronously.
Confirmation that a checkout has started.
HAL-style hypermedia links for navigation and available actions.
Show child attributes
Show child attributes
Identifier of the checkout to track its progress.
Checkout progress at acceptance — the same vocabulary the status endpoint returns: pending, tokenized, enrolled, or failed.