Cart payments
Authorize a Braintree transaction
Authorizes a Braintree transaction from a JS SDK nonce and stores the vault context on the cart. PaymentMethod creation happens via the payment_method endpoint afterwards.
POST
/
api
/
payments
/
v2026-04
/
carts
/
{cart_token}
/
braintree
/
pay
Authorize a Braintree transaction
curl --request POST \
--url https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay \
--header 'Content-Type: application/json' \
--data '
{
"payment_method_nonce": "fake-valid-nonce",
"payment_account_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"device_data": "{\"correlation_id\":\"abc123\"}"
}
'import requests
url = "https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay"
payload = {
"payment_method_nonce": "fake-valid-nonce",
"payment_account_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"device_data": "{\"correlation_id\":\"abc123\"}"
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
payment_method_nonce: 'fake-valid-nonce',
payment_account_id: '018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f',
device_data: '{"correlation_id":"abc123"}'
})
};
fetch('https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay', 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/payments/v2026-04/carts/{cart_token}/braintree/pay",
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([
'payment_method_nonce' => 'fake-valid-nonce',
'payment_account_id' => '018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f',
'device_data' => '{"correlation_id":"abc123"}'
]),
CURLOPT_HTTPHEADER => [
"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/payments/v2026-04/carts/{cart_token}/braintree/pay"
payload := strings.NewReader("{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}")
req, _ := http.NewRequest("POST", url, payload)
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/payments/v2026-04/carts/{cart_token}/braintree/pay")
.header("Content-Type", "application/json")
.body("{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}"
response = http.request(request)
puts response.read_body{
"transaction_id": "bt_txn_9f8e7d6c",
"payment_type": "braintree_paypal",
"meta": {
"request_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"timestamp": "2026-04-01T12:00:00Z"
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z",
"code": "payment_in_progress",
"shop_url": "<string>",
"cart": {}
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z",
"shop_url": "<string>",
"cart": {}
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z"
}
}Path Parameters
Opaque cart token returned by the create-cart response. It scopes the request to a single cart and is the credential for these endpoints — cart-token authentication carried in the path, with no bearer token or API key.
Body
application/json
Nonce from the Braintree JS SDK.
Braintree PaymentAccount UUID.
Braintree Data Collector fraud fingerprint.
The only value ever honored is braintree_paypal_pay_later, and only when the authorization is a PayPal account with no subscription in the cart; any other value is ignored and the type is taken from gateway detection instead.
Show child attributes
Show child attributes
The cart total the client showed the shopper, as a decimal string in
the cart currency's major unit ("141.74"). Requires
expected_currency.
Required while the company's quote-failure policy is enabled:
omitting it, or sending it malformed, answers 422 with an
expected_total or expected_currency error before the cart is repriced and before any
provider call. When it no longer matches the cart, the response is
409 with meta.code = cart_total_changed and nothing is charged;
retry with the total in meta.cart. Optional, and ignored, otherwise.
Pattern:
^\d{1,12}(\.\d{1,5})?$Example:
"141.74"
ISO 4217 code of the currency the shopper was shown. Requires expected_total.
Response
Transaction authorized
Success body for a Braintree authorization.
Braintree transaction id for the authorized charge; the vault context is stored on the cart and the PaymentMethod is created later via the payment_method endpoint.
Detected payment type (e.g. braintree_paypal, venmo).
Standard response metadata included on every response.
Show child attributes
Show child attributes
⌘I
Authorize a Braintree transaction
curl --request POST \
--url https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay \
--header 'Content-Type: application/json' \
--data '
{
"payment_method_nonce": "fake-valid-nonce",
"payment_account_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"device_data": "{\"correlation_id\":\"abc123\"}"
}
'import requests
url = "https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay"
payload = {
"payment_method_nonce": "fake-valid-nonce",
"payment_account_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"device_data": "{\"correlation_id\":\"abc123\"}"
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
payment_method_nonce: 'fake-valid-nonce',
payment_account_id: '018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f',
device_data: '{"correlation_id":"abc123"}'
})
};
fetch('https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay', 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/payments/v2026-04/carts/{cart_token}/braintree/pay",
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([
'payment_method_nonce' => 'fake-valid-nonce',
'payment_account_id' => '018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f',
'device_data' => '{"correlation_id":"abc123"}'
]),
CURLOPT_HTTPHEADER => [
"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/payments/v2026-04/carts/{cart_token}/braintree/pay"
payload := strings.NewReader("{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}")
req, _ := http.NewRequest("POST", url, payload)
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/payments/v2026-04/carts/{cart_token}/braintree/pay")
.header("Content-Type", "application/json")
.body("{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.fluid.app/api/payments/v2026-04/carts/{cart_token}/braintree/pay")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"payment_method_nonce\": \"fake-valid-nonce\",\n \"payment_account_id\": \"018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f\",\n \"device_data\": \"{\\\"correlation_id\\\":\\\"abc123\\\"}\"\n}"
response = http.request(request)
puts response.read_body{
"transaction_id": "bt_txn_9f8e7d6c",
"payment_type": "braintree_paypal",
"meta": {
"request_id": "018f2c1a-8b3a-7e6d-9f10-2a3b4c5d6e7f",
"timestamp": "2026-04-01T12:00:00Z"
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z"
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z",
"code": "payment_in_progress",
"shop_url": "<string>",
"cart": {}
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z",
"shop_url": "<string>",
"cart": {}
}
}{
"error_message": "<string>",
"errors": "<string>",
"meta": {
"request_id": "<string>",
"timestamp": "2023-11-07T05:31:56Z"
}
}