---
title: 'Subscriptions'
---

## POST /subscriptions/subscribe

Generates subscription for customer and returns a link to checkout session where user can review payment details, provides payment information, and purchase a subscription.

Body params -

| Parameter | type   | Description                      |
| --------- | ------ | -------------------------------- |
| priceId   | string | Id of the price for subscription |

Returns `checkoutLink` url with checkout form.

Stripe call snippet -

```typescript
  const session = await stripeService.checkout.sessions.create({
    mode: 'subscription',
    customer: user.stripeId,
    line_items: [{
      quantity: 1,
      price: priceId,
    }],
    success_url: `${config.webUrl}?subscriptionPlan=${priceId}`,
    cancel_url: config.WEB_URL,
  });
```

Parameters description -

| Parameter                                | type                                    | Description                                                                                                               |
| ---------------------------------------- | --------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| mode                                     | string                                  | The mode of the Checkout Session. For subscription it should be set to `subscription`                                     |
| customer                                 | string                                  | id of the stripe customer. if `undefined`, stripe will ask for the user's email and create a new customer upon purchasing |
| line_items                               | array                                   | Array with information about items that will be included in checkout session                                              |
| <ul><li>quantity</li><li>price</li></ul> | <ul><li>number</li><li>string</li></ul> | <ul><li>Amount of items (usually 1 for subscription)</li><li>id of the specific price of the product</li></ul>            |
| success_url                              | string                                  | The URL to which Stripe should send customers when payment or setup is complete                                           |
| cancel_url                               | string                                  | The URL the customer will be directed to if they decide to cancel payment and return to your website                      |

More information about stripe checkout object - [link](https://stripe.com/docs/api/checkout/sessions)

## POST /subscriptions/cancel-subscription

Cancels prolongation of a customer’s subscription. The customer will not be charged again for the subscription.

Stripe call snippet -

```typescript
  stripeService.subscriptions.update(user.subscription?.subscriptionId as string, {
      cancel_at_period_end: true,
  });
```

Parameters description -

| Parameter            | type    | Description                                                                          |
| -------------------- | ------- | ------------------------------------------------------------------------------------ |
| customer             | string  | id of the stripe customer                                                            |
| cancel_at_period_end | boolean | Indicating whether this subscription should cancel at the end of the current period. |

More information about subscription update - [link](https://stripe.com/docs/api/subscriptions/update)

## POST /subscriptions/upgrade

Changes customer's subscription plan (billing period or subscription plan)

Body params -

| Parameter | type   | Description                      |
| --------- | ------ | -------------------------------- |
| priceId   | string | Id of the price for subscription |

Stripe call snippet -

```typescript
  const subscriptionDetails = await stripeService.subscriptions.retrieve(subscriptionId);

  const items = [{
    id: subscriptionDetails.items.data[0].id,
    price: priceId,
  }];

  await stripeService.subscriptions.update(subscriptionId, {
    proration_behavior: 'always_invoice',
    cancel_at_period_end: false,
    items,
  });
```

Parameters description -

| Parameter                          | type                                    | Description                                                                                                                                                             |
| ---------------------------------- | --------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| subscriptionId                     | string                                  | id of the customer's active subscription                                                                                                                                |
| proration_behavior                 | string                                  | Determines how to handle prorations when the billing cycle changes (switching plan in this case). parameter `Always_invoice` is used to charge the customer immediately |
| cancel_at_period_end               | string                                  | Boolean indicating whether this subscription should cancel at the end of the current period.                                                                            |
| items                              | array                                   | array with information about subscription items                                                                                                                         |
| <ul><li>id</li><li>price</li></ul> | <ul><li>string</li><li>string</li></ul> | <ul><li>id of the customer's active subscription</li><li>id of the specific price of the product</li></ul>                                                              |

More information about subscription update - [link](https://stripe.com/docs/api/subscriptions/update)

## GET /subscriptions/current

Returns detailes subscription information along with pending invoice

Stripe call snippet -

```typescript
  const product = await stripeService.products.retrieve(user.subscription?.productId);
```

| Parameter | type   | Description                      |
| --------- | ------ | -------------------------------- |
| productId | string | id of the product (subscription) |

More information about products - [link](https://stripe.com/docs/api/products)

```typescript
  const pendingInvoice = await stripeService.invoices.retrieveUpcoming({
    subscription: user.subscription?.subscriptionId,
  });
```

| Parameter    | type   | Description                              |
| ------------ | ------ | ---------------------------------------- |
| subscription | string | id of the customer's active subscription |

More information about invoices - [link](https://stripe.com/docs/api/invoices)

## GET /subscriptions/preview-upgrade

Returns invoice with billing information of subscription upgrade/downgrade

Query params -

| Parameter | type   | Description                      |
| --------- | ------ | -------------------------------- |
| priceId   | string | Id of the price for subscription |

Returns invoice with payment details

Code snippet -

```typescript
  if (priceId === 'price_0') {
    items = [{
      id: subscriptionDetails.items.data[0].id,
      price_data: {
        currency: 'USD',
        product: user.subscription?.productId,
        recurring: {
          interval: subscriptionDetails.items.data[0].price.recurring?.interval,
          interval_count: 1,
        },
        unit_amount: 0,
      },
    }];
  } else {
    items = [{
      id: subscriptionDetails.items.data[0].id,
      price: priceId,
    }];
  }

  const invoice = await stripeService.invoices.retrieveUpcoming({
    customer: user.stripeId || undefined,
    subscription: user.subscription?.subscriptionId,
    subscription_items: items,
    subscription_proration_behavior: 'always_invoice',
  });
```

Parameters description -

| Parameter                          | type                                    | Description                                                                                                                                                                                 |
| ---------------------------------- | --------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| customer                           | string                                  | id of the stripe customer                                                                                                                                                                   |
| subscription                       | string                                  | id of customer's active subscription                                                                                                                                                        |
| subscription_proration_behavior    | string                                  | Determines how to handle prorations when the billing cycle changes (e.g., when switching plans, resetting billing_cycle_anchor=now, or starting a trial), or if an item’s quantity changes. |
| subscription_items                 | array                                   | array with information about subscription items                                                                                                                                             |
| <ul><li>id</li><li>price</li></ul> | <ul><li>string</li><li>string</li></ul> | <ul><li>id of the customer's active subscription</li><li>id of the specific price of the product</li></ul>                                                                                  |

In case the customer chooses free plan, we need to send a custom price object to stripe with unit_amount set to 0 in order to receive invoice with empty products and information about a refund for canceled subscription

Price data parameters -

| Parameter                                         | type                                    | Description                                                                                                                                   |
| ------------------------------------------------- | --------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| currency                                          | string                                  | Three-letter ISO currency code, in lowercase.                                                                                                 |
| product                                           | string                                  | id of subscription product                                                                                                                    |
| recurring                                         | object                                  | The recurring components of a price such as interval and interval_count                                                                       |
| <ul><li>interval</li><li>interval_count</li></ul> | <ul><li>string</li><li>number</li></ul> | <ul><li>Specifies billing frequency. Either day, week, month or year.</li><li>The number of intervals between subscription billings</li></ul> |
| unit_amount                                       | number                                  | A positive integer in cents (or 0 for a free price) representing how much to charge.                                                          |

More information about previewing upcoming invoices - [link](https://stripe.com/docs/api/invoices/upcoming)
