Subscription Upgrade & Downgrade Guide

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

# Show customer the charge before confirming
print("Immediate charge:", preview.immediate_charge.summary.total_amount, preview.immediate_charge.summary.currency)
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"
)

# change_plan returns 200 with a ChangePlanResponse body (payment_id, payment_link,
# client_secret, expires_on) — all None for an ordinary off-session change.
client.subscriptions.change_plan(
    subscription_id="sub_123",
    product_id="pdt_new",
    quantity=3,
    proration_billing_mode="prorated_immediately",
    on_payment_failure="prevent_change",  # Optional: control behavior on payment failure
)
print("Plan change accepted; awaiting webhooks")

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"))
  // ChangePlan returns a SubscriptionChangePlanResponse alongside the error.
  _, err := client.Subscriptions.ChangePlan(context.TODO(), "sub_123", dodopayments.SubscriptionChangePlanParams{
    UpdateSubscriptionPlanReq: dodopayments.UpdateSubscriptionPlanReqParam{
      ProductID:            dodopayments.F("pdt_new"),
      Quantity:             dodopayments.F(int64(3)),
      ProrationBillingMode: dodopayments.F(dodopayments.UpdateSubscriptionPlanReqProrationBillingModeProratedImmediately),
      OnPaymentFailure:     dodopayments.F(dodopayments.UpdateSubscriptionPlanReqOnPaymentFailurePreventChange), // Optional
    },
  })
  if err != nil { panic(err) }
  fmt.Println("Plan change applied")
}

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": "pdt_new",
    "quantity": 3,
    "proration_billing_mode": "prorated_immediately",
    "on_payment_failure": "prevent_change"
  }'

response = client.subscriptions.change_plan(
    subscription_id="sub_123",
    product_id="pdt_pro",
    quantity=1,
    proration_billing_mode="prorated_immediately",
    effective_at="immediately",
    on_payment_failure="prevent_change",
    collect_via_payment_link=True,
)

# Hand response.payment_link to your frontend and send the customer there
print(response.payment_link)

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": "pdt_pro",
    "quantity": 1,
    "proration_billing_mode": "prorated_immediately",
    "effective_at": "immediately",
    "on_payment_failure": "prevent_change",
    "collect_via_payment_link": true
  }'

# Apply stacked discount codes during plan change
client.subscriptions.change_plan(
    subscription_id="sub_123",
    product_id="pdt_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": "pdt_pro",
    "quantity": 1,
    "proration_billing_mode": "prorated_immediately",
    "discount_codes": ["UPGRADE20"]
  }'

await client.subscriptions.changePlan('sub_123', {
  product_id: 'pdt_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_PAYMENTS_WEBHOOK_KEY;
  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);