FOR DEVELOPERS

Root on the thing that bills your customers

No SDK sandbox, no partner API tier, no rate-limited window into your own billing. You get the source, the database, and the deploy key. Here's what's in the box.

The source, not a slideshow of it

# your instance, your repo

opensubs/

├─ apps/

│ ├─ billing-engine/ # contracts, renewals, proration

│ ├─ customer-portal/ # skip / swap / pause / gift

│ └─ analytics/ # MRR, churn, cohorts

├─ packages/

│ ├─ dunning/ # retries per decline code

│ └─ bundles/ # build-a-box, swaps

├─ scripts/ # the library, see below

└─ docs/ # runbooks + checklists

Full read/write on the repo

Fork it, patch it, rip a module out. It runs on your infrastructure, under your org.

Your database, literally

Postgres you can psql into. Every contract, renewal, and event row is yours to query.

Shopify-native billing

Contracts and charges go through Shopify's subscription API and vault: nothing card-shaped ever touches your servers.

Deploy like you deploy

Ship it however you ship: your CI, your environments, your rollback.

The script library

Copy, run, keep: guarantee or not. Each ships with a runbook in docs/.

migrate-recharge.ts

Pulls contracts, schedules, and discounts out of Recharge and recreates them natively. Dry-run mode first.

migrate-skio.ts

Same, for Skio. Cards never move: the vault is Shopify's.

invoice-audit.ts

Recomputes what your % apps billed you from raw order data. Bring this one to finance.

dunning-tuner.ts

Backtests retry timing per decline code against your own history and writes the config.

winback-flows.ts

Cancellation-reason-aware winback sequences, ready to wire to your ESP.

…plus the community drop: members ship new scripts weekly.

Everything fires an event. English ships the rest.

Webhooks & API

POST/api/contracts

GET/api/contracts/:id/schedule

HOOKrenewal/success

HOOKrenewal/failed

HOOKcontract/paused · swapped · cancelled

REST + webhooks on your own domain. No partner tier, no rate ceiling you don't set yourself.

The AI engineer

"Add a 10% loyalty discount to any renewal after the 6th."

→ branch: loyalty-discount-6th

→ 2 files changed, 14 tests added

→ PR open. Review the diff, then ship.

Every change lands as a reviewable PR on your instance. English in, diff out: you keep the merge button.

Get the deploy key

One flat annual membership. 60-day keep-everything guarantee.

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