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Fix free tier checkout and Stripe duplicate customers

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Free tier:
- checkout-stripe.el bails out immediately for plan=free (no Stripe init)
- checkout-auth.el skips payment section reveal and initStripe for free plan
- checkout-free.el shows #free-success panel after auth (no card ever shown)
- /api/payment-intent returns early for free plan — no Stripe call

Stripe dedup (all paid plans):
- Stripe init now deferred to window.initStripe(email, name), called by
  checkout-auth.el after sign-in — email is known before intent is created
- /api/payment-intent finds-or-creates Stripe Customer by email before
  creating the PaymentIntent/SetupIntent and attaches customer upfront
- Eliminates the window between intent creation and /api/link-customer
  that was producing duplicate guest customers
This commit is contained in:
Will Anderson
2026-05-07 01:00:51 -05:00
parent f0a6b55a13
commit 00e62bb010
5 changed files with 71 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/checkout.el
+11 -1
View File
@@ -97,7 +97,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
<div id=\"auth-section\" " + (if is_free { "" } else { "style=\"display:none;\"" }) + ">
" + (if is_free { "
<p class=\"label\" style=\"margin-bottom: 1.5rem; color: var(--navy);\">Create your account.</p>
<p class=\"checkout-auth-hint\" style=\"margin-bottom: 2rem;\">No charge today. Add your card to reserve your spot - you won&#39;t be billed until you upgrade.</p>
<p class=\"checkout-auth-hint\" style=\"margin-bottom: 2rem;\">No card required. Your account is free, forever.</p>
" } else { "
<p class=\"label\" style=\"margin-bottom: 1.25rem;\">Sign in (optional)</p>
<p class=\"checkout-auth-hint\">Sign in to link this purchase to an existing account. Or skip and create one later - we'll match it to your email.</p>
@@ -135,6 +135,16 @@ fn checkout_page(plan: String, pub_key: String) -> String {
</div>
</div>
<!-- Free-tier success panel: shown after account creation, no card needed -->
" + (if is_free { "
<div id=\"free-success\" style=\"display:none; text-align:center; padding: 2.5rem 1rem;\">
<div style=\"font-size:2.5rem; margin-bottom:1.25rem;\">&#10003;</div>
<p class=\"label\" style=\"margin-bottom:.75rem; color:var(--navy);\">You&#39;re in.</p>
<p class=\"checkout-auth-hint\" style=\"margin-bottom:2rem;\">Your free account is ready. Download Neuron to get started.</p>
<a href=\"/marketplace\" class=\"checkout-submit\" style=\"display:inline-block; text-decoration:none; padding:.875rem 2rem;\">Go to your account &#8594;</a>
</div>
" } else { "" }) + "
<!-- Payment form (visible immediately - no auth wall) -->
<div id=\"payment-section\" " + (if is_free { "style=\"display:none;\"" } else { "" }) + ">
<div id=\"auth-badge\" style=\"display:none; margin-bottom: 1.5rem;\"></div>
src/js/checkout-auth.el
+10 -5
View File
@@ -33,8 +33,11 @@ fn main() -> Void {
if (user && user.id) { window._neuronSupaId = user.id; }
var auth = document.getElementById('auth-section');
if (auth) auth.style.display = 'none';
var payment = document.getElementById('payment-section');
if (payment) payment.style.display = '';
var isFree = (window.NEURON_CFG || {}).plan === 'free';
if (!isFree) {
var payment = document.getElementById('payment-section');
if (payment) payment.style.display = '';
}
if (user) {
var badge = document.getElementById('auth-badge');
@@ -55,9 +58,11 @@ fn main() -> Void {
if (emailEl) emailEl.value = user.email;
}
var userEmail = user ? (user.email || '') : '';
var userName = user ? ((user.user_metadata && user.user_metadata.full_name) || '') : '';
if (typeof initStripe === 'function') initStripe(userEmail, userName);
if (!isFree) {
var userEmail = user ? (user.email || '') : '';
var userName = user ? ((user.user_metadata && user.user_metadata.full_name) || '') : '';
if (typeof window.initStripe === 'function') window.initStripe(userEmail, userName);
}
}
function checkExistingSession() {
src/js/checkout-free.el
+8 -5
View File
@@ -1,15 +1,18 @@
// checkout-free.el -- Free plan: reveal payment section after auth completes.
// Watches the auth-badge element; when it becomes visible, shows payment-section.
// checkout-free.el -- Free plan: show success panel after auth completes.
// Watches the auth-badge element; when it becomes visible, hides the auth
// section and shows the free-success panel. No card required for free tier.
// Compiled with: elc --target=js --bundle --minify --obfuscate
fn main() -> Void {
native_js("(function() {
var pay = document.getElementById('payment-section');
if (!pay) return;
var success = document.getElementById('free-success');
var auth = document.getElementById('auth-section');
if (!success) return;
var timer = setInterval(function() {
var badge = document.getElementById('auth-badge');
if (badge && badge.offsetParent !== null) {
pay.style.display = '';
if (auth) auth.style.display = 'none';
success.style.display = '';
clearInterval(timer);
}
}, 150);
src/js/checkout-stripe.el
+17 -6
View File
@@ -31,8 +31,13 @@ fn main() -> Void {
if (spinner) spinner.style.display = loading ? '' : 'none';
}
// Free plan has no payment form — bail out entirely.
if (str_eq(PLAN, 'free')) return;
window._neuronMode = 'payment';
var paymentEl = null;
var userEmail = '';
var userName = '';
function appearance() {
return {
@@ -80,7 +85,7 @@ fn main() -> Void {
return fetch('/api/payment-intent', {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({ plan: PLAN, timing: timing })
body: JSON.stringify({ plan: PLAN, timing: timing, email: userEmail, name: userName })
})
.then(function(r) { return r.json(); })
.then(function(data) {
@@ -117,11 +122,17 @@ fn main() -> Void {
});
}
fetchAndMount();
var tNow = document.getElementById('timing-now');
var tLater = document.getElementById('timing-later');
if (tNow) tNow.addEventListener('change', fetchAndMount);
if (tLater) tLater.addEventListener('change', fetchAndMount);
// Don't init Stripe at page load — wait for auth.
// checkout-auth.el calls window.initStripe(email, name) after sign-in.
window.initStripe = function(email, name) {
userEmail = email || '';
userName = name || '';
fetchAndMount();
var tNow = document.getElementById('timing-now');
var tLater = document.getElementById('timing-later');
if (tNow) tNow.addEventListener('change', fetchAndMount);
if (tLater) tLater.addEventListener('change', fetchAndMount);
};
var form = document.getElementById('payment-form');
if (form) form.addEventListener('submit', async function(e) {
src/main.el
+25 -16
View File
@@ -584,23 +584,9 @@ fn handle_request_inner(method: String, path: String, body: String) -> String {
}
let timing: String = json_get_string(body, "timing")
if str_eq(timing, "") { let timing = "now" }
// Free tier: SetupIntent — save card details without charging.
// Card is stored on a Stripe Customer; billing begins only if the
// user later upgrades to a paid plan.
// Free tier: no card required. Return immediately — no Stripe interaction.
if str_eq(plan, "free") {
let si_body: String = "automatic_payment_methods[enabled]=true"
+ "&usage=off_session"
+ "&metadata[plan]=free"
let auth_header: String = "Bearer " + stripe_key
let si_resp: String = http_post_form_auth(
"https://api.stripe.com/v1/setup_intents",
si_body,
auth_header)
if str_starts_with(si_resp, "{") {
let inner: String = str_slice(si_resp, 1, str_len(si_resp))
return "{\"setup_mode\":true,\"plan\":\"free\"," + inner
}
return si_resp
return "{\"plan\":\"free\",\"free\":true,\"no_payment_required\":true}"
}
// Hard cap: block founding checkouts when 1,000 spots are filled
if str_eq(plan, "founding") {
@@ -612,6 +598,27 @@ fn handle_request_inner(method: String, path: String, body: String) -> String {
}
let auth_header: String = "Bearer " + stripe_key
// Find-or-create Stripe Customer by email upfront so every intent
// is attached to an existing customer — prevents duplicate customers.
let pi_email: String = json_get_string(body, "email")
let pi_name: String = json_get_string(body, "name")
let pi_cus_id: String = ""
if !str_eq(pi_email, "") {
let pi_email_enc: String = str_replace(str_replace(pi_email, "@", "%40"), "+", "%2B")
let pi_search_url: String = "https://api.stripe.com/v1/customers/search?query=email%3A%22" + pi_email_enc + "%22&limit=1"
let pi_search: String = http_get_auth(pi_search_url, auth_header)
let pi_cus_id = json_get_string(pi_search, "id")
if str_eq(pi_cus_id, "") {
let pi_name_enc: String = str_replace(pi_name, " ", "%20")
let pi_cus_body: String = "email=" + pi_email_enc
+ "&name=" + pi_name_enc
+ "&metadata[plan]=" + plan
+ "&metadata[source]=neuron-checkout"
let pi_cus_resp: String = http_post_form_auth("https://api.stripe.com/v1/customers", pi_cus_body, auth_header)
let pi_cus_id = json_get_string(pi_cus_resp, "id")
}
}
// Setup-mode path: save payment method, do not charge. Only valid
// for Professional (Founding is one-shot lifetime, charges immediately).
if str_eq(plan, "professional") && str_eq(timing, "later") {
@@ -620,6 +627,7 @@ fn handle_request_inner(method: String, path: String, body: String) -> String {
+ "&metadata[plan]=" + plan
+ "&metadata[hold_until]=launch"
+ "&metadata[launch_target]=2026-09-01"
let si_body = if !str_eq(pi_cus_id, "") { si_body + "&customer=" + pi_cus_id } else { si_body }
let si_resp: String = http_post_form_auth(
"https://api.stripe.com/v1/setup_intents",
si_body,
@@ -642,6 +650,7 @@ fn handle_request_inner(method: String, path: String, body: String) -> String {
+ "&automatic_payment_methods[enabled]=true"
+ "&metadata[plan]=" + plan
+ "&metadata[timing]=" + timing
let pi_body = if !str_eq(pi_cus_id, "") { pi_body + "&customer=" + pi_cus_id } else { pi_body }
let response: String = http_post_form_auth(
"https://api.stripe.com/v1/payment_intents",
pi_body,