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cfw-autumn/apps/docs/mintlify/examples/prepaid.mdx
Ayush Rodrigues 2aac9b3a8b docs wip
2026-03-09 16:26:15 +00:00

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---
title: One-time top ups
description: Let customers purchase a prepaid package to top up their balance when it falls low.
---
If a user hits a usage limit you granted them, they may be willing to purchase a top-up.
These are typically one-time purchases (but can also be recurring add-ons) that grant a fixed usage of a feature.
This gives users full spend control and allows your business to be paid upfront. For these reasons, it tends to be a more popular alternative to usage-based pricing -- eg, OpenAI uses this model for their API.
## Example case
In this example, we have an AI chatbot that offers:
- 10 messages per month for free
- An option for customers to top-up messages in packages of $10 per 100 messages.
## Configure Pricing
<Steps>
<Step>
#### Create Features
Create a `metered` `consumable` feature for our messages, so we can track their balance.
<Frame>
<img src="/assets/guides/prepaid/features-light.png" className="block dark:hidden" />
<img src="/assets/guides/prepaid/features-dark.png" className="hidden dark:block" />
</Frame>
</Step>
<Step>
#### Create Free and Top-up Plans
**Free Plan** <br />
Create a free plan, and assign 10 messages to it. We'll add an interval of "month", so that the user is granted 10 periodically.
<Tip>
Make sure to set the `auto-enable` flag on the free plan, so that it is automatically assigned to new customers.
</Tip>
<Frame>
<img src="/assets/guides/prepaid/free-light.png" className="block dark:hidden" />
<img src="/assets/guides/prepaid/free-dark.png" className="hidden dark:block" />
</Frame>
**Top up Plan** <br />
Now we'll create our top-up plan. Again, we'll assign the messages feature, but this time with a `prepaid` price of $10 per 100 messages.
Since these messages have interval "one-off", the messages will last forever (unlike our Free plan messages, which reset every month).
Features with a `prepaid` price require a `quantity` to be passed in when a customer purchases the plan, so the customer can specify how many messages they want to top up with.
<Frame>
<img src="/assets/guides/prepaid/topup-light.png" className="block dark:hidden" />
<img src="/assets/guides/prepaid/topup-dark.png" className="hidden dark:block" />
</Frame>
</Step>
</Steps>
## Implementation
<Steps>
<Step>
#### Create an Autumn Customer
When your user signs up, create an Autumn customer. This will automatically assign them the Free plan, and grant them the 10 monthly messages.
<CodeGroup>
```jsx React
import { useCustomer } from "autumn-js/react";
const App = () => {
const { customer } = useCustomer();
console.log("Autumn customer:", customer);
return <h1>Welcome, {customer?.name || "user"}!</h1>;
};
```
```typescript Node.js
import { Autumn } from "autumn-js";
const autumn = new Autumn({
secretKey: 'am_sk_42424242',
});
const { data, error } = await autumn.customers.create({
id: "user_or_org_id_from_auth",
name: "John Yeo",
email: "john@example.com",
});
```
```python Python
import asyncio
from autumn import Autumn
autumn = Autumn('am_sk_42424242')
async def main():
customer = await autumn.customers.create(
id="user_or_org_id_from_auth",
name="John Yeo",
email="john@example.com",
)
asyncio.run(main())
```
```bash cURL
curl --request POST \
--url https://api.useautumn.com/customers \
--header 'Authorization: Bearer am_sk_42424242' \
--header 'Content-Type: application/json' \
--data '{
"id": "user_or_org_id_from_auth",
"name": "John Yeo",
"email": "john@example.com"
}'
```
</CodeGroup>
</Step>
<Step>
#### Checking for access
Before our user sends a message, we'll first check if they have a balance of messages remaining.
<CodeGroup>
```jsx React wrap
import { useCustomer } from "autumn-js/react";
export function CheckPremiumMessage() {
const { check, refetch } = useCustomer();
const handleCheckAccess = async () => {
const { data } = await check({ featureId: "messages" });
if (!data?.allowed) {
alert("You've run out of messages");
} else {
// proceed with sending message
await refetch();
}
};
}
```
```typescript Node.js
import { Autumn } from "autumn-js";
const autumn = new Autumn({
secretKey: 'am_sk_42424242',
});
const { data } = await autumn.check({
customer_id: "user_or_org_id_from_auth",
feature_id: "messages",
});
if (!data.allowed) {
console.log("User has run out of messages");
return;
}
```
```python Python
import asyncio
from autumn import Autumn
autumn = Autumn("am_sk_1234567890")
async def main():
response = await autumn.check(
customer_id="user_or_org_id_from_auth",
feature_id="messages",
)
if not response.allowed:
print("User has run out of messages")
return
asyncio.run(main())
```
```bash cURL
curl -X POST "https://api.useautumn.com/v1/check" \
-H "Authorization: Bearer am_sk_1234567890" \
-H "Content-Type: application/json" \
-d '{
"customer_id": "user_or_org_id_from_auth",
"feature_id": "messages"
}'
```
</CodeGroup>
<Expandable title="check response">
```json
{
"customer_id": "user_or_org_id_from_auth",
"feature_id": "messages",
"code": "feature_found",
"allowed": true,
"balance": 10,
"usage": 0,
"included_usage": 10,
"unlimited": false,
"interval": null,
"interval_count": 1,
"next_reset_at": 2803498203,
"overage_allowed": false
}
```
</Expandable>
</Step>
<Step>
#### Tracking messages used
After the user has used a message, record it in Autumn to decrease their remaining balance. In this example, the user used 5 messages.
<CodeGroup>
```typescript Node.js
import { Autumn } from "autumn-js";
const autumn = new Autumn({
secretKey: 'am_sk_42424242',
});
await autumn.track({
customer_id: "user_or_org_id_from_auth",
feature_id: "messages",
value: 5,
});
```
```python Python
import asyncio
from autumn import Autumn
autumn = Autumn("am_sk_42424242")
async def main():
await autumn.track(
customer_id="user_or_org_id_from_auth",
feature_id="messages",
value=5,
)
asyncio.run(main())
```
```bash cURL
curl -X POST "https://api.useautumn.com/v1/track" \
-H "Authorization: Bearer am_sk_42424242" \
-H "Content-Type: application/json" \
-d '{
"customer_id": "user_or_org_id_from_auth",
"feature_id": "messages",
"value": 5
}'
```
</CodeGroup>
<Expandable title="track response">
```json
{
"code": "event_received",
"customer_id": "user_or_org_id_from_auth",
"feature_id": "messages"
}
```
</Expandable>
</Step>
<Step>
#### Purchasing top-ups
When users run out of messages, they can purchase additional messages using our top-up plan. In this example, the user is purchasing 200 premium messages, which will cost them $20.
<CodeGroup>
```jsx React
import { useCustomer, CheckoutDialog } from "autumn-js/react";
export default function TopUpButton() {
const { checkout } = useCustomer();
return (
<button
onClick={async () => {
await checkout({
productId: "top_up",
dialog: CheckoutDialog,
options: [{
featureId: "messages",
quantity: 200,
}],
});
}}
>
Buy More Messages
</button>
);
}
```
```typescript Node.js
import { Autumn } from "autumn-js";
const autumn = new Autumn({
secretKey: 'am_sk_42424242',
});
const { data } = await autumn.checkout({
customer_id: "user_or_org_id_from_auth",
product_id: "top_up",
options: [{
feature_id: "messages",
quantity: 200,
}],
});
if (data.url) {
// Redirect user to Stripe checkout URL
} else {
// Show purchase preview to user
}
```
```python Python
import asyncio
from autumn import Autumn
autumn = Autumn("am_sk_42424242")
async def main():
response = await autumn.checkout(
customer_id="user_or_org_id_from_auth",
product_id="top-up",
options=[{
"feature_id": "messages",
"quantity": 200,
}],
)
if response.url:
# Redirect user to Stripe checkout URL
pass
else:
# Show purchase preview to user
pass
asyncio.run(main())
```
```bash cURL
curl -X POST "https://api.useautumn.com/v1/checkout" \
-H "Authorization: Bearer am_sk_42424242" \
-H "Content-Type: application/json" \
-d '{
"customer_id": "user_or_org_id_from_auth",
"product_id": "top-up",
"options": [{
"feature_id": "messages",
"quantity": 200
}]
}'
```
</CodeGroup>
<Expandable title="checkout response">
```json
{
"customer_id": "user_or_org_id_from_auth",
"lines": [
{
"description": "Top-up - 200 premium messages",
"amount": 20,
"item": {
"type": "feature",
"feature_id": "premium-messages",
"feature_type": "prepaid",
"feature": {
"id": "premium-messages",
"name": "Premium messages",
"type": "metered",
"display": {
"singular": "premium message",
"plural": "premium messages"
}
},
"quantity": 200,
"price": 10,
"price_per": 100,
"display": {
"primary_text": "200 premium messages",
"secondary_text": "$10 per 100 messages"
}
}
}
],
"product": {
"id": "top-up",
"name": "Top-up",
"group": null,
"env": "sandbox",
"is_add_on": false,
"is_default": false,
"archived": false,
"version": 1,
"created_at": 1766428038264,
"items": [
{
"type": "feature",
"feature_id": "premium-messages",
"feature_type": "prepaid",
"feature": {
"id": "premium-messages",
"name": "Premium messages",
"type": "metered",
"display": {
"singular": "premium message",
"plural": "premium messages"
}
},
"price": 10,
"price_per": 100,
"display": {
"primary_text": "$10 per 100 messages"
}
}
],
"free_trial": null,
"base_variant_id": null,
"scenario": "attach",
"properties": {
"is_free": false,
"is_one_off": true,
"has_trial": false,
"updateable": false
}
},
"total": 20,
"currency": "usd",
"url": "https://checkout.stripe.com/c/pay/.......",
"has_prorations": false
}
```
</Expandable>
Once the customer completes the payment, they will have an additional 200 premium messages available to use.
</Step>
<Step>
#### Displaying balances to the user
You can display to the user by getting balances from the `customer` method. Under the `customer.features` record, you'll be able to retrieve a current balance, total granted, and a `breakdown` of their monthly vs top-up messages.
<CodeGroup>
```jsx React [expandable]
import { useCustomer } from "autumn-js/react";
const { customer } = useCustomer();
const messages = customer?.features?.messages;
// Get breakdown of monthly vs prepaid balances
const monthlyBalance = messages?.breakdown?.find(
(b) => b.interval === "month"
);
const prepaidBalance = messages?.breakdown?.find(
(b) => b.interval === "lifetime"
);
// Display both balances to the user
return (
<div>
<p>Monthly: {monthlyBalance?.balance ?? 0} remaining</p>
<p>Prepaid: {prepaidBalance?.balance ?? 0} remaining</p>
<p>Total: {messages?.balance ?? 0} messages available</p>
</div>
);
```
```typescript Node.js [expandable]
import { Autumn } from "autumn-js";
const autumn = new Autumn({
secretKey: 'am_sk_42424242',
});
const { data } = await autumn.customer({
customer_id: "user_or_org_id_from_auth",
});
const messages = data?.features?.messages;
// Extract monthly vs prepaid balances from the breakdown
const monthlyBalance = messages?.breakdown?.find(
(b) => b.interval === "month"
);
const prepaidBalance = messages?.breakdown?.find(
(b) => b.interval === "lifetime"
);
console.log(`Monthly: ${monthlyBalance?.balance ?? 0} remaining`);
console.log(`Prepaid: ${prepaidBalance?.balance ?? 0} remaining`);
console.log(`Total: ${messages?.balance ?? 0} messages available`);
```
```python Python [expandable]
import asyncio
from autumn import Autumn
autumn = Autumn("am_sk_42424242")
async def main():
response = await autumn.customer(
customer_id="user_or_org_id_from_auth",
)
messages = response.features.get("messages", {})
breakdown = messages.get("breakdown", [])
# Extract monthly vs prepaid balances
monthly = next((b for b in breakdown if b.get("interval") == "month"), None)
prepaid = next((b for b in breakdown if b.get("interval") == "lifetime"), None)
print(f"Monthly: {monthly['balance'] if monthly else 0} remaining")
print(f"Prepaid: {prepaid['balance'] if prepaid else 0} remaining")
print(f"Total: {messages.get('balance', 0)} messages available")
asyncio.run(main())
```
```bash cURL
curl -X GET "https://api.useautumn.com/v1/customers/user_or_org_id_from_auth" \
-H "Authorization: Bearer am_sk_42424242" \
-H "Content-Type: application/json"
# get features usage object from customer.features.[feature_id]
```
</CodeGroup>
<Expandable title="customer response">
```json
{
"features": {
"messages": {
"id": "messages",
"type": "single_use",
"name": "Messages",
"interval": "multiple",
"interval_count": null,
"unlimited": false,
"balance": 205,
"usage": 5,
"included_usage": 210,
"next_reset_at": null,
"overage_allowed": false,
"breakdown": [
{
"interval": "month",
"interval_count": 1,
"balance": 5,
"usage": 5,
"included_usage": 10,
"next_reset_at": 1772191445539,
"overage_allowed": false
},
{
"interval": "lifetime",
"interval_count": 1,
"balance": 200,
"usage": 0,
"included_usage": 200,
"next_reset_at": null,
"overage_allowed": false
}
]
}
},
}
```
</Expandable>
</Step>
</Steps>