Subscription Upgrade & Downgrade Guide

preview = client.subscriptions.preview_change_plan(
    subscription_id="sub_123",
    product_id="prod_pro",
    quantity=1,
    proration_billing_mode="prorated_immediately"
)

# Show customer the charge before confirming
print("Immediate charge:", preview.immediate_charge.summary)
print("New plan details:", preview.new_plan)

import os
from dodopayments import DodoPayments

client = DodoPayments(
    bearer_token=os.environ.get("DODO_PAYMENTS_API_KEY"),
    environment="test_mode",  # defaults to "live_mode"
)

result = client.subscriptions.change_plan(
    subscription_id="sub_123",
    product_id="prod_new",
    quantity=3,
    proration_billing_mode="prorated_immediately",
    on_payment_failure="prevent_change",  # Optional: control behavior on payment failure
)
print(result.status, result.get("invoice_id"), result.get("payment_id"))

package main

import (
  "context"
  "fmt"
  "github.com/dodopayments/dodopayments-go"
  "github.com/dodopayments/dodopayments-go/option"
)

func main() {
  client := dodopayments.NewClient(option.WithBearerToken("YOUR_TOKEN"))
  res, err := client.Subscriptions.ChangePlan(context.TODO(), dodopayments.SubscriptionChangePlanParams{
    SubscriptionID: dodopayments.F("sub_123"),
    ProductID:             dodopayments.F("prod_new"),
    Quantity:              dodopayments.F(int64(3)),
    ProrationBillingMode:  dodopayments.F(dodopayments.SubscriptionChangePlanParamsProrationBillingModeProratedImmediately),
    OnPaymentFailure:      dodopayments.F(dodopayments.OnPaymentFailurePreventChange), // Optional
  })
  if err != nil { panic(err) }
  fmt.Println(res.Status, res.InvoiceID, res.PaymentID)
}

curl -X POST "$DODO_API_BASE/subscriptions/sub_123/change-plan" \
  -H "Authorization: Bearer $DODO_PAYMENTS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "product_id": "prod_new",
    "quantity": 3,
    "proration_billing_mode": "prorated_immediately",
    "on_payment_failure": "prevent_change"
  }'

# Apply stacked discount codes during plan change
client.subscriptions.change_plan(
    subscription_id="sub_123",
    product_id="prod_pro",
    quantity=1,
    proration_billing_mode="prorated_immediately",
    discount_codes=["UPGRADE20"]
)

curl -X POST "$DODO_API_BASE/subscriptions/sub_123/change-plan" \
  -H "Authorization: Bearer $DODO_PAYMENTS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "product_id": "prod_pro",
    "quantity": 1,
    "proration_billing_mode": "prorated_immediately",
    "discount_codes": ["UPGRADE20"]
  }'

await client.subscriptions.changePlan('sub_123', {
  product_id: 'prod_pro',
  quantity: 1,
  proration_billing_mode: 'prorated_immediately',
  on_payment_failure: 'apply_change' // This is the default
});

import express from 'express';

const app = express();
app.post('/webhooks/dodo', express.raw({ type: 'application/json' }), async (req, res) => {
  const webhookId = req.header('webhook-id');
  const webhookSignature = req.header('webhook-signature');
  const webhookTimestamp = req.header('webhook-timestamp');
  const secret = process.env.DODO_WEBHOOK_SECRET;
  const payload = req.body.toString('utf8');

  const { valid, event } = await verifySignature(
    payload,
    { id: webhookId, signature: webhookSignature, timestamp: webhookTimestamp },
    secret
  );
  if (!valid) return res.status(400).send('Invalid signature');

  // handle events like above
  res.json({ received: true });
});

app.listen(3000);