curl --request POST \
  --url https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/billing-plans \
  --header 'Content-Type: application/json-patch+json' \
  --header 'x-revolv3-token: <api-key>' \
  --data '
{
  "name": "New Billing Plan",
  "value": 5.99,
  "cycleCount": 12,
  "valueType": "Standard",
  "startCycleDelay": 0
}
'

import requests

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

payload = {
    "name": "New Billing Plan",
    "value": 5.99,
    "cycleCount": 12,
    "valueType": "Standard",
    "startCycleDelay": 0
}
headers = {
    "x-revolv3-token": "<api-key>",
    "Content-Type": "application/json-patch+json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-revolv3-token': '<api-key>', 'Content-Type': 'application/json-patch+json'},
  body: JSON.stringify({
    name: 'New Billing Plan',
    value: 5.99,
    cycleCount: 12,
    valueType: 'Standard',
    startCycleDelay: 0
  })
};

fetch('https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/billing-plans', 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}/billing-plans",
  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([
    'name' => 'New Billing Plan',
    'value' => 5.99,
    'cycleCount' => 12,
    'valueType' => 'Standard',
    'startCycleDelay' => 0
  ]),
  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}/billing-plans"

	payload := strings.NewReader("{\n  \"name\": \"New Billing Plan\",\n  \"value\": 5.99,\n  \"cycleCount\": 12,\n  \"valueType\": \"Standard\",\n  \"startCycleDelay\": 0\n}")

	req, _ := http.NewRequest("POST", 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.post("https://api-sandbox.revolv3.com/api/Subscriptions/{subscriptionId}/billing-plans")
  .header("x-revolv3-token", "<api-key>")
  .header("Content-Type", "application/json-patch+json")
  .body("{\n  \"name\": \"New Billing Plan\",\n  \"value\": 5.99,\n  \"cycleCount\": 12,\n  \"valueType\": \"Standard\",\n  \"startCycleDelay\": 0\n}")
  .asString();

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Post.new(url)
request["x-revolv3-token"] = '<api-key>'
request["Content-Type"] = 'application/json-patch+json'
request.body = "{\n  \"name\": \"New Billing Plan\",\n  \"value\": 5.99,\n  \"cycleCount\": 12,\n  \"valueType\": \"Standard\",\n  \"startCycleDelay\": 0\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": "9/1/2026",
  "nextBillDate": "10/1/2026",
  "taxAddress": null,
  "paymentMethodIds": [
    1,
    2
  ],
  "cancelledAt": null,
  "billingPlans": [
    {
      "subscriptionBillingPlanId": 1,
      "subscriptionId": 0,
      "name": "Billing Plan 1",
      "value": 10.99,
      "startDate": "9/1/2026",
      "cyclesRemaining": -1,
      "cycleCount": 0,
      "valueType": "Standard"
    },
    {
      "subscriptionBillingPlanId": 2,
      "subscriptionId": 0,
      "name": "Billing Plan 2",
      "value": 14.99,
      "startDate": "10/1/2026",
      "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."
}