Subscription Payments

Send payment method update email to customer

Triggers Shopify to send an email to the subscription customer with a secure link to update their payment method. This endpoint initiates Shopify’s native payment update flow without requiring direct payment handling.

Key Features:

Sends official Shopify payment update email to customer
Customer receives secure link to Shopify-hosted payment update page
No PCI compliance required - Shopify handles all payment data
Supports all Shopify-supported payment methods
Automatically updates subscription after customer completes the process

Process Flow:

API call triggers email send request to Shopify
Shopify sends branded email to customer’s registered email
Customer clicks secure link in email
Customer authenticates on Shopify-hosted page
Customer adds/updates payment method
Subscription automatically uses new payment method

Email Details:

Sent from Shopify’s email servers
Uses store’s configured sender email
Subject line typically: “Update your payment method”
Contains secure, time-limited link
Shopify-branded with store information

Use Cases:

Failed payment recovery
Expiring credit card updates
Customer-requested payment changes
Proactive payment method maintenance

Important Notes:

Customer must have valid email address
Email cannot be customized (Shopify template)
Link expiration time set by Shopify
Multiple emails can be sent if needed
No webhook for completion - poll contract for updates

Rate Limiting:

Subject to Shopify’s email sending limits
Recommended: Wait 24 hours between sends to same customer
Excessive sends may be blocked by Shopify

Authentication: Requires valid X-API-Key header

PUT

api

external

subscription-contracts-update-payment-method

Send payment method update email to customer

curl --request PUT \
  --url https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method \
  --header 'X-API-Key: <x-api-key>'

import requests

url = "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method"

headers = {"X-API-Key": "<x-api-key>"}

response = requests.put(url, headers=headers)

print(response.text)

const options = {method: 'PUT', headers: {'X-API-Key': '<x-api-key>'}};

fetch('https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const url = 'https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method';
const options = {method: 'PUT', headers: {'X-API-Key': '<x-api-key>'}};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_HTTPHEADER => [
    "X-API-Key: <x-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"
	"net/http"
	"io"
)

func main() {

	url := "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method"

	req, _ := http.NewRequest("PUT", url, nil)

	req.Header.Add("X-API-Key", "<x-api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["X-API-Key"] = '<x-api-key>'

response = http.request(request)
puts response.read_body

{
  "message": "Payment method update email sent successfully"
}

Headers

X-API-Key

string

required

API Key for authentication

Query Parameters

contractId

integer<int64>

required

Subscription contract ID for payment method update. Must be a valid contract ID that belongs to the authenticated shop.

Required range: x >= 1

api_key

string

API Key (Deprecated - Use X-API-Key header instead)

Response

Payment update email sent successfully

Send payment method update email to customer

curl --request PUT \
  --url https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method \
  --header 'X-API-Key: <x-api-key>'

import requests

url = "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method"

headers = {"X-API-Key": "<x-api-key>"}

response = requests.put(url, headers=headers)

print(response.text)

const options = {method: 'PUT', headers: {'X-API-Key': '<x-api-key>'}};

fetch('https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const url = 'https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method';
const options = {method: 'PUT', headers: {'X-API-Key': '<x-api-key>'}};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_HTTPHEADER => [
    "X-API-Key: <x-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"
	"net/http"
	"io"
)

func main() {

	url := "https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method"

	req, _ := http.NewRequest("PUT", url, nil)

	req.Header.Add("X-API-Key", "<x-api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://subscription-admin.appstle.com/api/external/v2/subscription-contracts-update-payment-method")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["X-API-Key"] = '<x-api-key>'

response = http.request(request)
puts response.read_body

{
  "message": "Payment method update email sent successfully"
}

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Send payment method update email to customer

Headers

Query Parameters

Response