Technical depth for developers, practical payment thinking for founders, and real implementation lessons from building credit-based AI and SaaS products with Stripe.
For developers and founders
Help builders design products that can charge, fulfill, recover, and scale more safely. Credits, webhooks, refunds, and async jobs are not only backend details. They affect user trust, pricing flexibility, revenue reporting, and support load.
Developers will get concrete implementation patterns for credits, webhooks, idempotency, async jobs, and settlement.
Founders will get a clearer mental model for why payment architecture matters before a product reaches real usage.
Users can receive free balance, your revenue numbers become noisy, and support has to clean up state manually.
Customers lose trust because they paid or spent credits for work that never completed.
Retries, duplicate webhooks, and out-of-order events can break product access right after payment.
It becomes harder to experiment with subscriptions, credit packs, usage-based pricing, trials, and global customers.
About the series
A lot of builders start with Checkout. The harder questions appear later: what happens after payment succeeds but the async job has not finished, when webhooks retry, when jobs fail, or when pricing evolves from one-time purchases into credits, subscriptions, and usage-based models.
The early series use BabySea's open-source work as reference material: ledger-fortress for the settlement invariants, and generative-media-starter for the product boundary around auth, billing, storage, generation, and deployment. The patterns are not specific to BabySea; they apply to AI apps, SaaS products, devtools, render workloads, exports, batch jobs, and other credit-based products.
The first three workshops run online and focus on implementation. The fourth series is an offline meetup for developers, founders, startup operators, and local builders thinking about global products.
How do you avoid charging users unfairly when an async job fails?
Reserve credits before dispatch, then charge on success or refund on failure with transactional ledger writes.
How do you prevent duplicate credits when Stripe retries a webhook?
Use webhook signature verification, a processed event table, and SQL-level idempotency gates.
How do you recover stuck balances before they become support tickets?
Detect orphaned reservations and refund them idempotently without racing the success path.
How do you keep pricing flexible as the product grows?
Design credits, subscriptions, one-time packs, and usage events around a ledger that remains authoritative.
How do you keep the client, Stripe, and background jobs from disagreeing?
Move balance mutations behind backend-only functions and make the database the settlement authority.
Reference material
The series is grounded in working code: one reusable settlement primitive and one deployable app starter that shows how the payment boundary fits into a real product.
OSS primitive
A Stripe + Supabase credit settlement primitive for async inference workloads. It gives the workshops a concrete ledger boundary for reserves, charges, refunds, idempotency, and recovery.
OSS starter
A deployable Next.js starter for credit-based generative media products. It shows the app boundary around auth, Stripe credit packs, BabySea SDK execution, private storage, and deployment readiness.
The series
Three online workshops go deep on credit ledger design, Stripe webhook safety, and async job settlement. The fourth series in Makassar brings the community together.
Series 01
Technical workshop
Build the ledger for prepaid credits, charges, and refunds.
A practical workshop on the credit ledger behind a paid product: balances, immutable ledger rows, prepaid grants, reservations before work starts, terminal charges, and refunds when work fails.
Why it matters
Developers will learn the database patterns that make the balance authoritative. Founders will understand how credit mistakes become revenue leakage, unfair charging, and support burden.
Audience: Developers, technical founders, and product-minded builders
Series 02
Technical workshop
Prevent duplicate credits, missed fulfillment, and retry-related bugs.
A workshop on what happens after payment succeeds: verifying Stripe events, processing webhooks safely, granting credits once, and keeping product access aligned with payment state.
Why it matters
Developers will implement the idempotency layer that keeps fulfillment safe under retries. Founders will see why webhook reliability directly affects customer trust, paid access, and manual support load.
Audience: Developers integrating Stripe and founders reviewing fulfillment risk
Series 03
Technical workshop
Reserve, charge, refund, and recover async jobs safely.
A deeper workshop on separating payment state from work state when jobs can timeout, crash, return partial output, or finish out of order. We will walk through the lifecycle needed to keep user balances correct.
Why it matters
Developers will learn the settlement lifecycle behind reliable paid async work. Founders will understand how async failure modes affect margin, refunds, trust, and support.
Audience: Developers running async workloads and founders building usage-based products
Series 04
Community meetup
A Makassar meetup for builders going global.
An offline community meetup for developers, founders, local Stripe users, startup operators, and student builders to share lessons, questions, and practical notes on building products for global customers.
Why it matters
This series connects the technical workshops to broader startup questions: pricing, trust, global customers, payment methods, product readiness, and moving from prototype to production.
Audience: Developers, founders, startup operators, and local builders
What you will learn
Every credit-billed product eventually meets the same failure modes: duplicate webhooks, double-clicks, out-of-order terminal events, crashed jobs, renewals that interact with credit packs, and balance writes from the wrong boundary. The workshops translate each failure mode into a product risk and an implementation pattern.
Developer pattern: Implement reserve→charge→refund with a single UPDATE ... WHERE credits >= cost check-and-deduct, so concurrent requests cannot overdraw the balance.
Founder meaning: Users are not charged for failed work, and your product has a fair lifecycle for paid usage.
Developer pattern: Use processed event tables and unique constraints so duplicate Stripe and provider events are exactly-once at the database, not just the application.
Founder meaning: Stripe retries do not accidentally grant credits twice or create confusing billing state.
Developer pattern: Serialize terminal settlement with row locks and inspect prior ledger rows before mutating the balance.
Founder meaning: Your system remains correct even when success, failure, refund, or retry events arrive in the wrong order.
Developer pattern: Verify webhook signatures, gate processed Stripe events, and grant credits additively so renewals never reset purchased credit packs.
Founder meaning: Payments and product access stay aligned, so users receive what they paid for without manual cleanup.
Developer pattern: Run a recovery sweep that finds old reservations without terminal charge or refund rows, then refunds them idempotently against the success path.
Founder meaning: Stuck jobs do not become stuck balances, refund disputes, or avoidable support conversations.
Developer pattern: Protect credit tables with RLS, revoke direct client mutations, and route writes through server-side functions with a locked execution boundary.
Founder meaning: Users cannot manipulate balances from the browser, and the product has a clearer trust boundary.
Frequently asked questions
The online series include code-level material for developers, but founders and product builders are welcome if they want to understand the architecture behind credits, subscriptions, async jobs, and monetization.
The first three series are built for developers, but founders and product builders are welcome. The goal is to connect payment architecture with product reliability, pricing flexibility, user trust, and revenue safety.
They are technical, but each series starts from the product problem before going into implementation. Developers will see code-level patterns; founders will understand why those patterns matter for charging, fulfillment, refunds, and support.
Stripe for payments, Supabase Postgres as the ledger authority, and a TypeScript or Next.js backend around the reference starter. The patterns translate to other server runtimes and Postgres-backed applications.
No. The walkthroughs reference the open-source ledger-fortress primitive and the generative-media-starter app, but you can follow the architecture and implementation without deploying anything before the series.
For developers, comfort with APIs, databases, webhooks, and server-side code will help. Prior Stripe experience is useful but not required. For founders, curiosity about pricing, billing, and product reliability is enough.
No. AI is the running example because async failures are visible, but the settlement patterns apply to any credit-billed workload: AI generation, render jobs, exports, batch processing, developer tools, or usage-based SaaS.
The first three technical series run online. The fourth series is planned as an offline community meetup in Makassar for developers, founders, and local builders.
No. BabySea open-source projects are used as reference material because these are problems we have actually worked through. The patterns are general and apply to many AI, SaaS, devtool, and credit-based products.
The reference code is public through ledger-fortress and generative-media-starter. Workshop materials and recordings will be shared with registrants when available.
SEA Builders Series is organized by the host under Stripe Makassar Community, which is part of the Stripe Community Builder program.
Stripe Makassar Community
Follow the full series across online technical workshops and the offline community meetup. Join as a developer who wants implementation patterns, or as a founder who wants a clearer payment architecture mental model.
