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<h1 id="payment-integration-guide">Payment Integration Guide</h1>
<p>This guide shows how to sell your encrypted <code>.smsg</code> content and deliver license keys (passwords) to customers using popular payment processors.</p>
<h2 id="overview">Overview</h2>
<p>The dapp.fm model is simple:</p>
<pre><code>1. Customer pays via Stripe/Gumroad/PayPal
2. Payment processor triggers webhook or delivers digital product
3. Customer receives password (license key)
4. Customer downloads .smsg from your CDN/IPFS
5. Customer decrypts with password - done forever
</code></pre>
<p>No license servers, no accounts, no ongoing infrastructure.</p>
<h2 id="stripe-integration">Stripe Integration</h2>
<h3 id="option-1-stripe-payment-links-easiest">Option 1: Stripe Payment Links (Easiest)</h3>
<p>No code required - use Stripe's hosted checkout:</p>
<ol>
<li>Create a Payment Link in Stripe Dashboard</li>
<li>Set up a webhook to email the password on successful payment</li>
<li>Host your <code>.smsg</code> file anywhere (CDN, IPFS, S3)</li>
</ol>
<p><strong>Webhook endpoint (Node.js/Express):</strong></p>
<pre><code class="language-javascript">const express = require('express');
const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
const nodemailer = require('nodemailer');
const app = express();
// Your content passwords (store securely!)
const PRODUCTS = {
'prod_ABC123': {
name: 'My Album',
password: 'PMVXogAJNVe_DDABfTmLYztaJAzsD0R7',
downloadUrl: 'https://ipfs.io/ipfs/QmYourCID'
}
};
app.post('/webhook', express.raw({type: 'application/json'}), async (req, res) =&gt; {
const sig = req.headers['stripe-signature'];
const endpointSecret = process.env.STRIPE_WEBHOOK_SECRET;
let event;
try {
event = stripe.webhooks.constructEvent(req.body, sig, endpointSecret);
} catch (err) {
return res.status(400).send(`Webhook Error: ${err.message}`);
}
if (event.type === 'checkout.session.completed') {
const session = event.data.object;
const customerEmail = session.customer_details.email;
const productId = session.metadata.product_id;
const product = PRODUCTS[productId];
if (product) {
await sendLicenseEmail(customerEmail, product);
}
}
res.json({received: true});
});
async function sendLicenseEmail(email, product) {
const transporter = nodemailer.createTransport({
// Configure your email provider
service: 'gmail',
auth: {
user: process.env.EMAIL_USER,
pass: process.env.EMAIL_PASS
}
});
await transporter.sendMail({
from: 'artist@example.com',
to: email,
subject: `Your License Key for ${product.name}`,
html: `
&lt;h1&gt;Thank you for your purchase!&lt;/h1&gt;
&lt;p&gt;&lt;strong&gt;Download:&lt;/strong&gt; &lt;a href=&quot;${product.downloadUrl}&quot;&gt;${product.name}&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;License Key:&lt;/strong&gt; &lt;code&gt;${product.password}&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;How to play:&lt;/strong&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;Download the .smsg file from the link above&lt;/li&gt;
&lt;li&gt;Go to &lt;a href=&quot;https://demo.dapp.fm&quot;&gt;demo.dapp.fm&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;Click &quot;Fan&quot; tab, then &quot;Unlock Licensed Content&quot;&lt;/li&gt;
&lt;li&gt;Paste the file and enter your license key&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;This is your permanent license - save this email!&lt;/p&gt;
`
});
}
app.listen(3000);
</code></pre>
<h3 id="option-2-stripe-checkout-session-more-control">Option 2: Stripe Checkout Session (More Control)</h3>
<pre><code class="language-javascript">const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
// Create checkout session
app.post('/create-checkout', async (req, res) =&gt; {
const { productId } = req.body;
const session = await stripe.checkout.sessions.create({
payment_method_types: ['card'],
line_items: [{
price: 'price_ABC123', // Your Stripe price ID
quantity: 1,
}],
mode: 'payment',
success_url: 'https://yoursite.com/success?session_id={CHECKOUT_SESSION_ID}',
cancel_url: 'https://yoursite.com/cancel',
metadata: {
product_id: productId
}
});
res.json({ url: session.url });
});
// Success page - show license after payment
app.get('/success', async (req, res) =&gt; {
const session = await stripe.checkout.sessions.retrieve(req.query.session_id);
if (session.payment_status === 'paid') {
const product = PRODUCTS[session.metadata.product_id];
res.send(`
&lt;h1&gt;Thank you!&lt;/h1&gt;
&lt;p&gt;Download: &lt;a href=&quot;${product.downloadUrl}&quot;&gt;${product.name}&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;License Key: &lt;code&gt;${product.password}&lt;/code&gt;&lt;/p&gt;
`);
} else {
res.send('Payment not completed');
}
});
</code></pre>
<h2 id="gumroad-integration">Gumroad Integration</h2>
<p>Gumroad is perfect for artists - handles payments, delivery, and customer management.</p>
<h3 id="setup">Setup</h3>
<ol>
<li>Create a Digital Product on Gumroad</li>
<li>Upload a text file or PDF containing the password</li>
<li>Set your <code>.smsg</code> download URL in the product description</li>
<li>Gumroad delivers the password file on purchase</li>
</ol>
<h3 id="product-setup">Product Setup</h3>
<p><strong>Product Description:</strong></p>
<pre><code>My Album - Encrypted Digital Download
After purchase, you'll receive:
1. A license key (in the download)
2. Download link for the .smsg file
How to play:
1. Download the .smsg file: https://ipfs.io/ipfs/QmYourCID
2. Go to https://demo.dapp.fm
3. Click &quot;Fan&quot;&quot;Unlock Licensed Content&quot;
4. Enter your license key from the PDF
</code></pre>
<p><strong>Delivered File (license.txt):</strong></p>
<pre><code>Your License Key: PMVXogAJNVe_DDABfTmLYztaJAzsD0R7
Download your content: https://ipfs.io/ipfs/QmYourCID
This is your permanent license - keep this file safe!
The content works offline forever with this key.
Need help? Visit https://demo.dapp.fm
</code></pre>
<h3 id="gumroad-ping-webhook">Gumroad Ping (Webhook)</h3>
<p>For automated delivery, use Gumroad's Ping feature:</p>
<pre><code class="language-javascript">const express = require('express');
const app = express();
app.use(express.urlencoded({ extended: true }));
// Gumroad sends POST to this endpoint on sale
app.post('/gumroad-ping', (req, res) =&gt; {
const {
seller_id,
product_id,
email,
full_name,
purchaser_id
} = req.body;
// Verify it's from Gumroad (check seller_id matches yours)
if (seller_id !== process.env.GUMROAD_SELLER_ID) {
return res.status(403).send('Invalid seller');
}
const product = PRODUCTS[product_id];
if (product) {
// Send custom email with password
sendLicenseEmail(email, product);
}
res.send('OK');
});
</code></pre>
<h2 id="paypal-integration">PayPal Integration</h2>
<h3 id="paypal-buttons-ipn">PayPal Buttons + IPN</h3>
<pre><code class="language-html">&lt;!-- PayPal Buy Button --&gt;
&lt;form action=&quot;https://www.paypal.com/cgi-bin/webscr&quot; method=&quot;post&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;cmd&quot; value=&quot;_xclick&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;business&quot; value=&quot;artist@example.com&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;item_name&quot; value=&quot;My Album - Digital Download&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;item_number&quot; value=&quot;album-001&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;amount&quot; value=&quot;9.99&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;currency_code&quot; value=&quot;USD&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;notify_url&quot; value=&quot;https://yoursite.com/paypal-ipn&quot;&gt;
&lt;input type=&quot;hidden&quot; name=&quot;return&quot; value=&quot;https://yoursite.com/thank-you&quot;&gt;
&lt;input type=&quot;submit&quot; value=&quot;Buy Now - $9.99&quot;&gt;
&lt;/form&gt;
</code></pre>
<p><strong>IPN Handler:</strong></p>
<pre><code class="language-javascript">const express = require('express');
const axios = require('axios');
app.post('/paypal-ipn', express.urlencoded({ extended: true }), async (req, res) =&gt; {
// Verify with PayPal
const verifyUrl = 'https://ipnpb.paypal.com/cgi-bin/webscr';
const verifyBody = 'cmd=_notify-validate&amp;' + new URLSearchParams(req.body).toString();
const response = await axios.post(verifyUrl, verifyBody);
if (response.data === 'VERIFIED' &amp;&amp; req.body.payment_status === 'Completed') {
const email = req.body.payer_email;
const itemNumber = req.body.item_number;
const product = PRODUCTS[itemNumber];
if (product) {
await sendLicenseEmail(email, product);
}
}
res.send('OK');
});
</code></pre>
<h2 id="ko-fi-integration">Ko-fi Integration</h2>
<p>Ko-fi is great for tips and single purchases.</p>
<h3 id="setup_1">Setup</h3>
<ol>
<li>Enable "Commissions" or "Shop" on Ko-fi</li>
<li>Create a product with the license key in the thank-you message</li>
<li>Link to your .smsg download</li>
</ol>
<p><strong>Ko-fi Thank You Message:</strong></p>
<pre><code>Thank you for your purchase!
Your License Key: PMVXogAJNVe_DDABfTmLYztaJAzsD0R7
Download: https://ipfs.io/ipfs/QmYourCID
Play at: https://demo.dapp.fm (Fan → Unlock Licensed Content)
</code></pre>
<h2 id="serverless-options">Serverless Options</h2>
<h3 id="vercelnetlify-functions">Vercel/Netlify Functions</h3>
<p>No server needed - use serverless functions:</p>
<pre><code class="language-javascript">// api/stripe-webhook.js (Vercel)
import Stripe from 'stripe';
import { Resend } from 'resend';
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY);
const resend = new Resend(process.env.RESEND_API_KEY);
export default async function handler(req, res) {
if (req.method !== 'POST') {
return res.status(405).end();
}
const sig = req.headers['stripe-signature'];
const event = stripe.webhooks.constructEvent(
req.body,
sig,
process.env.STRIPE_WEBHOOK_SECRET
);
if (event.type === 'checkout.session.completed') {
const session = event.data.object;
await resend.emails.send({
from: 'artist@yoursite.com',
to: session.customer_details.email,
subject: 'Your License Key',
html: `
&lt;p&gt;Download: &lt;a href=&quot;https://ipfs.io/ipfs/QmYourCID&quot;&gt;My Album&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;License Key: &lt;code&gt;PMVXogAJNVe_DDABfTmLYztaJAzsD0R7&lt;/code&gt;&lt;/p&gt;
`
});
}
res.json({ received: true });
}
export const config = {
api: { bodyParser: false }
};
</code></pre>
<h2 id="manual-workflow-no-code">Manual Workflow (No Code)</h2>
<p>For artists who don't want to set up webhooks:</p>
<h3 id="using-email">Using Email</h3>
<ol>
<li><strong>Gumroad/Ko-fi</strong>: Set product to require email</li>
<li><strong>Manual delivery</strong>: Check sales daily, email passwords manually</li>
<li><strong>Template</strong>:</li>
</ol>
<pre><code>Subject: Your License for [Album Name]
Hi [Name],
Thank you for your purchase!
Download: [IPFS/CDN link]
License Key: [password]
How to play:
1. Download the .smsg file
2. Go to demo.dapp.fm
3. Fan tab → Unlock Licensed Content
4. Enter your license key
Enjoy! This license works forever.
[Artist Name]
</code></pre>
<h3 id="using-discordtelegram">Using Discord/Telegram</h3>
<ol>
<li>Sell via Gumroad (free tier)</li>
<li>Require customers join your Discord/Telegram</li>
<li>Bot or manual delivery of license keys</li>
<li>Community building bonus!</li>
</ol>
<h2 id="security-best-practices">Security Best Practices</h2>
<h3 id="1-one-password-per-product">1. One Password Per Product</h3>
<p>Don't reuse passwords across products:</p>
<pre><code class="language-javascript">const PRODUCTS = {
'album-2024': { password: 'unique-key-1' },
'album-2023': { password: 'unique-key-2' },
'single-summer': { password: 'unique-key-3' }
};
</code></pre>
<h3 id="2-environment-variables">2. Environment Variables</h3>
<p>Never hardcode passwords in source:</p>
<pre><code class="language-bash"># .env
ALBUM_2024_PASSWORD=PMVXogAJNVe_DDABfTmLYztaJAzsD0R7
STRIPE_SECRET_KEY=sk_live_...
</code></pre>
<h3 id="3-webhook-verification">3. Webhook Verification</h3>
<p>Always verify webhooks are from the payment provider:</p>
<pre><code class="language-javascript">// Stripe
stripe.webhooks.constructEvent(body, sig, secret);
// Gumroad
if (seller_id !== MY_SELLER_ID) reject();
// PayPal
verify with IPN endpoint
</code></pre>
<h3 id="4-https-only">4. HTTPS Only</h3>
<p>All webhook endpoints must use HTTPS.</p>
<h2 id="pricing-strategies">Pricing Strategies</h2>
<h3 id="direct-sale-perpetual-license">Direct Sale (Perpetual License)</h3>
<ul>
<li>Customer pays once, owns forever</li>
<li>Single password for all buyers</li>
<li>Best for: Albums, films, books</li>
</ul>
<h3 id="time-limited-streamingrental">Time-Limited (Streaming/Rental)</h3>
<p>Use dapp.fm Re-Key feature:</p>
<ol>
<li>Encrypt master copy with master password</li>
<li>On purchase, re-key with customer-specific password + expiry</li>
<li>Deliver unique password per customer</li>
</ol>
<pre><code class="language-javascript">// On purchase webhook
const customerPassword = generateUniquePassword();
const expiry = Date.now() + (24 * 60 * 60 * 1000); // 24 hours
// Use WASM or Go to re-key
const customerVersion = await rekeyContent(masterSmsg, masterPassword, customerPassword, expiry);
// Deliver customer-specific file + password
</code></pre>
<h3 id="tiered-access">Tiered Access</h3>
<p>Different passwords for different tiers:</p>
<pre><code class="language-javascript">const TIERS = {
'preview': { password: 'preview-key', expiry: '30s' },
'rental': { password: 'rental-key', expiry: '7d' },
'own': { password: 'perpetual-key', expiry: null }
};
</code></pre>
<h2 id="example-complete-stripe-setup">Example: Complete Stripe Setup</h2>
<pre><code class="language-bash"># 1. Create your content
go run ./cmd/mkdemo album.mp4 album.smsg
# Password: PMVXogAJNVe_DDABfTmLYztaJAzsD0R7
# 2. Upload to IPFS
ipfs add album.smsg
# QmAlbumCID
# 3. Create Stripe product
# Dashboard → Products → Add Product
# Name: My Album
# Price: $9.99
# 4. Create Payment Link
# Dashboard → Payment Links → New
# Select your product
# Get link: https://buy.stripe.com/xxx
# 5. Set up webhook
# Dashboard → Developers → Webhooks → Add endpoint
# URL: https://yoursite.com/api/stripe-webhook
# Events: checkout.session.completed
# 6. Deploy webhook handler (Vercel example)
vercel deploy
# 7. Share payment link
# Fans click → Pay → Get email with password → Download → Play forever
</code></pre>
<h2 id="resources">Resources</h2>
<ul>
<li><a href="https://stripe.com/docs/webhooks">Stripe Webhooks</a></li>
<li><a href="https://help.gumroad.com/article/149-ping">Gumroad Ping</a></li>
<li><a href="https://developer.paypal.com/docs/ipn/">PayPal IPN</a></li>
<li><a href="https://resend.com/">Resend (Email API)</a></li>
<li><a href="https://vercel.com/docs/functions">Vercel Functions</a></li>
</ul>
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