curl --request PUT \
  --url https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method \
  --header 'Content-Type: application/json-patch+json' \
  --header 'x-revolv3-token: <api-key>' \
  --data '
{
  "existingPaymentMethod": null,
  "paymentMethod": {
    "taxAmount": 2.57,
    "originalNetworkTransactionId": "test-transaction-id",
    "billingAddress": {
      "addressId": null,
      "addressLine1": "100 Main Street",
      "addressLine2": null,
      "city": "Irvine",
      "state": "CA",
      "postalCode": "92602",
      "phoneNumber": null,
      "email": null,
      "country": "US"
    },
    "creditCard": {
      "paymentAccountNumber": "4111111111111111",
      "expirationDate": "1025",
      "securityCode": null,
      "networkToken": null
    },
    "ach": null,
    "googlePay": null,
    "applePay": null,
    "merchantPaymentMethodRefId": null,
    "billingFirstName": "John",
    "billingLastName": "Doe",
    "billingFullName": null
  }
}
'

import requests

url = "https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method"

payload = {
    "existingPaymentMethod": None,
    "paymentMethod": {
        "taxAmount": 2.57,
        "originalNetworkTransactionId": "test-transaction-id",
        "billingAddress": {
            "addressId": None,
            "addressLine1": "100 Main Street",
            "addressLine2": None,
            "city": "Irvine",
            "state": "CA",
            "postalCode": "92602",
            "phoneNumber": None,
            "email": None,
            "country": "US"
        },
        "creditCard": {
            "paymentAccountNumber": "4111111111111111",
            "expirationDate": "1025",
            "securityCode": None,
            "networkToken": None
        },
        "ach": None,
        "googlePay": None,
        "applePay": None,
        "merchantPaymentMethodRefId": None,
        "billingFirstName": "John",
        "billingLastName": "Doe",
        "billingFullName": None
    }
}
headers = {
    "x-revolv3-token": "<api-key>",
    "Content-Type": "application/json-patch+json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {'x-revolv3-token': '<api-key>', 'Content-Type': 'application/json-patch+json'},
  body: JSON.stringify({
    existingPaymentMethod: null,
    paymentMethod: {
      taxAmount: 2.57,
      originalNetworkTransactionId: 'test-transaction-id',
      billingAddress: {
        addressId: null,
        addressLine1: '100 Main Street',
        addressLine2: null,
        city: 'Irvine',
        state: 'CA',
        postalCode: '92602',
        phoneNumber: null,
        email: null,
        country: 'US'
      },
      creditCard: {
        paymentAccountNumber: '4111111111111111',
        expirationDate: '1025',
        securityCode: null,
        networkToken: null
      },
      ach: null,
      googlePay: null,
      applePay: null,
      merchantPaymentMethodRefId: null,
      billingFirstName: 'John',
      billingLastName: 'Doe',
      billingFullName: null
    }
  })
};

fetch('https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method', 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-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/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_POSTFIELDS => json_encode([
    'existingPaymentMethod' => null,
    'paymentMethod' => [
        'taxAmount' => 2.57,
        'originalNetworkTransactionId' => 'test-transaction-id',
        'billingAddress' => [
                'addressId' => null,
                'addressLine1' => '100 Main Street',
                'addressLine2' => null,
                'city' => 'Irvine',
                'state' => 'CA',
                'postalCode' => '92602',
                'phoneNumber' => null,
                'email' => null,
                'country' => 'US'
        ],
        'creditCard' => [
                'paymentAccountNumber' => '4111111111111111',
                'expirationDate' => '1025',
                'securityCode' => null,
                'networkToken' => null
        ],
        'ach' => null,
        'googlePay' => null,
        'applePay' => null,
        'merchantPaymentMethodRefId' => null,
        'billingFirstName' => 'John',
        'billingLastName' => 'Doe',
        'billingFullName' => null
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json-patch+json",
    "x-revolv3-token: <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-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method"

	payload := strings.NewReader("{\n  \"existingPaymentMethod\": null,\n  \"paymentMethod\": {\n    \"taxAmount\": 2.57,\n    \"originalNetworkTransactionId\": \"test-transaction-id\",\n    \"billingAddress\": {\n      \"addressId\": null,\n      \"addressLine1\": \"100 Main Street\",\n      \"addressLine2\": null,\n      \"city\": \"Irvine\",\n      \"state\": \"CA\",\n      \"postalCode\": \"92602\",\n      \"phoneNumber\": null,\n      \"email\": null,\n      \"country\": \"US\"\n    },\n    \"creditCard\": {\n      \"paymentAccountNumber\": \"4111111111111111\",\n      \"expirationDate\": \"1025\",\n      \"securityCode\": null,\n      \"networkToken\": null\n    },\n    \"ach\": null,\n    \"googlePay\": null,\n    \"applePay\": null,\n    \"merchantPaymentMethodRefId\": null,\n    \"billingFirstName\": \"John\",\n    \"billingLastName\": \"Doe\",\n    \"billingFullName\": null\n  }\n}")

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

	req.Header.Add("x-revolv3-token", "<api-key>")
	req.Header.Add("Content-Type", "application/json-patch+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://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method")
  .header("x-revolv3-token", "<api-key>")
  .header("Content-Type", "application/json-patch+json")
  .body("{\n  \"existingPaymentMethod\": null,\n  \"paymentMethod\": {\n    \"taxAmount\": 2.57,\n    \"originalNetworkTransactionId\": \"test-transaction-id\",\n    \"billingAddress\": {\n      \"addressId\": null,\n      \"addressLine1\": \"100 Main Street\",\n      \"addressLine2\": null,\n      \"city\": \"Irvine\",\n      \"state\": \"CA\",\n      \"postalCode\": \"92602\",\n      \"phoneNumber\": null,\n      \"email\": null,\n      \"country\": \"US\"\n    },\n    \"creditCard\": {\n      \"paymentAccountNumber\": \"4111111111111111\",\n      \"expirationDate\": \"1025\",\n      \"securityCode\": null,\n      \"networkToken\": null\n    },\n    \"ach\": null,\n    \"googlePay\": null,\n    \"applePay\": null,\n    \"merchantPaymentMethodRefId\": null,\n    \"billingFirstName\": \"John\",\n    \"billingLastName\": \"Doe\",\n    \"billingFullName\": null\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/payment-method")

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

request = Net::HTTP::Put.new(url)
request["x-revolv3-token"] = '<api-key>'
request["Content-Type"] = 'application/json-patch+json'
request.body = "{\n  \"existingPaymentMethod\": null,\n  \"paymentMethod\": {\n    \"taxAmount\": 2.57,\n    \"originalNetworkTransactionId\": \"test-transaction-id\",\n    \"billingAddress\": {\n      \"addressId\": null,\n      \"addressLine1\": \"100 Main Street\",\n      \"addressLine2\": null,\n      \"city\": \"Irvine\",\n      \"state\": \"CA\",\n      \"postalCode\": \"92602\",\n      \"phoneNumber\": null,\n      \"email\": null,\n      \"country\": \"US\"\n    },\n    \"creditCard\": {\n      \"paymentAccountNumber\": \"4111111111111111\",\n      \"expirationDate\": \"1025\",\n      \"securityCode\": null,\n      \"networkToken\": null\n    },\n    \"ach\": null,\n    \"googlePay\": null,\n    \"applePay\": null,\n    \"merchantPaymentMethodRefId\": null,\n    \"billingFirstName\": \"John\",\n    \"billingLastName\": \"Doe\",\n    \"billingFullName\": null\n  }\n}"

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

{
  "subscriptionId": 1,
  "customerId": 1,
  "merchantSubscriptionRefId": "1234-5678-9101",
  "networkTransactionId": null,
  "billingIntervalType": "Months",
  "billingIntervalCount": 1,
  "subscriptionStatusType": "Current",
  "subscriptionCancelType": "Immediate",
  "initialBillDate": "10/12/2026",
  "nextBillDate": "11/12/2026",
  "taxAddress": null,
  "paymentMethodIds": [
    1,
    2
  ],
  "cancelledAt": null,
  "billingPlans": [
    {
      "subscriptionBillingPlanId": 1,
      "subscriptionId": 0,
      "name": "Billing Plan 1",
      "value": 10.99,
      "startDate": "10/12/2026",
      "cyclesRemaining": -1,
      "cycleCount": 0,
      "valueType": "Standard"
    },
    {
      "subscriptionBillingPlanId": 2,
      "subscriptionId": 0,
      "name": "Billing Plan 2",
      "value": 14.99,
      "startDate": "11/12/2026",
      "cyclesRemaining": 12,
      "cycleCount": 0,
      "valueType": "Standard"
    }
  ],
  "message": null,
  "paymentProcessor": null,
  "processorMerchantId": null,
  "processorRawResponse": null,
  "currency": null,
  "responseMessage": null,
  "responseCode": null
}

{
  "message": "Unable to perform the request action with provided data."
}

{
  "message": "Attempted to perform an unauthorized operation."
}

{
  "message": "Unable to find an entity with the provided data."
}