Fix the payments and financial integrations your software depends on.
I diagnose and repair Stripe, QuickBooks/ERP, OAuth, webhook, data-sync, and reconciliation failures in live B2B systems when money, data correctness, or customer operations are at risk.
Musah Abdulai · Backend & Integration Engineer
One customer · three systems
Stripe
subscription: active
Application DB
subscription: past_due
QuickBooks
invoice: not found
Bring me in when the systems disagree.
A payment succeeded, but the application still shows the wrong subscription state.
A webhook was missed, duplicated, delayed, or handled out of order.
QuickBooks or ERP synchronization stopped, duplicated records, or no longer ties out.
OAuth expiry or reauthorization silently broke a connection.
A backfill or migration changed financial or operational data unexpectedly.
The team cannot prove which system is correct or safely repair the affected records.
Repair the workflow, reconcile the data, verify the release.
I take responsibility for the failure from diagnosis through implementation and post-release verification: system mapping, root cause, code changes, targeted data repair, tests, observability, rollout, rollback, and handover.
Stripe and subscription-state repair
QuickBooks and ERP integration repair
OAuth, webhook, retry, idempotency, and background-job failures
Data synchronization, backfills, migrations, and reconciliation
Monitoring and operational handover for critical integrations
The failures this service is built for
Stripe integration repair, QuickBooks and ERP synchronization, webhook debugging, OAuth recovery, and data reconciliation share one property: two systems hold different answers about money or records, and guessing is expensive.
Stripe and application subscription state disagree.
A webhook is missed, duplicated, delayed, or processed out of order.
A retry or background job creates duplicate financial records.
QuickBooks or an ERP connection silently stops after OAuth expiration or reauthorization.
Source and destination fields map incorrectly or drift over time.
A sync cannot be reconciled to the system of record.
Historical data needs to be backfilled without duplicating or overwriting valid records.
A migration leaves balances, invoices, customers, subscriptions, jobs, or ledgers inconsistent.
Monitoring cannot distinguish a temporary provider error from a permanent data failure.
The team does not have a safe rollout, rollback, and post-release verification plan.
What this offer is — and what it is not
The valuable work is ownership of state, retries, backfills, invariants, reconciliation, rollout, and verification — not writing one endpoint.
In scope
- Payment-state failures, duplicate charges, missed events, subscription divergence, webhook ordering, and recovery.
- QuickBooks/ERP OAuth, synchronization, data mapping, retries, backfills, duplicates, reconciliation, and operational monitoring.
- Financial-data migrations and production cutovers where data preservation and verification matter.
- Existing B2B systems with users, revenue, important internal operations, or a committed launch.
- Fixed-scope repair when the problem is understood; paid diagnosis when it is not.
Not the primary offer
- Generic payment gateway setup with no meaningful business or state complexity.
- Simple one-off exports, spreadsheet cleanup, or no-code connector configuration.
- Greenfield CRUD applications, landing pages, and ordinary MVP implementation.
- Idea-only founders, equity-only work, and clients without repository or system access.
- A mandatory audit before every piece of work.
Known problem or unclear system?
Known problem
You can name the failure and the required outcome. I scope and quote the repair directly — no diagnostic friction for its own sake.
Unclear or high-risk problem
The system is inherited, the data may already be inconsistent, or the cause is unknown. Start with a fixed-scope, paid Integration Failure Diagnostic: failure map, affected data, containment, and a prioritized repair plan with a quote.
Prefer to write it down first?
Describe the problem by emailWhat a repair engagement produces
Every engagement has a stated system boundary and acceptance criteria. “Done” is operational, not aspirational.
Standard repair deliverables
- Reproduce and document the failure with evidence.
- Map the relevant systems, state transitions, ownership, and business invariants.
- Identify root cause and the affected data or users.
- Implement the agreed repair in the existing codebase and infrastructure.
- Add targeted tests for happy paths, retries, duplicates, ordering, expiry, partial failure, and recovery where relevant.
- Repair or backfill affected records only within an explicitly approved plan.
- Add the minimum useful logs, metrics, alerts, and operational notes.
- Prepare rollout and rollback steps.
- Verify the result after release against agreed acceptance criteria.
- Document remaining risks and exclusions.
Definition of done
- The named failure is reproducibly resolved in the agreed environment.
- Tests cover the agreed business invariants and relevant failure modes.
- The affected records reconcile to the agreed source of truth or a documented exception list.
- Deployment and rollback steps are documented and exercised where practical.
- You can observe the integration’s health after handover.
- Known residual risks and excluded cases are written down.
Proof from systems I have actually built.
No invented case studies. The first item is a production SaaS product I founded, built, and operate; the rest is public and verifiable.
ClearWIP
A production financial-integration system I founded and operate: construction WIP reporting built around QuickBooks synchronization and Stripe billing. It is product and architecture proof — not a consulting case study — and it exercises the same failure modes this service repairs.
- QuickBooks authorization and synchronization
- Data mapping and provenance
- Retries, idempotency, and background processing
- Reconciliation and deterministic financial calculations
- Multi-tenant data boundaries
- Stripe subscriptions and billing
- Deployment, monitoring, backups, and recovery
Who this is for
Good fit
- Existing B2B software with users, revenue, meaningful internal operations, funding, or a committed customer launch.
- A named payment, integration, migration, reliability, or production problem.
- You can provide repository, test, data, and infrastructure context safely.
- A problem where correctness, rollout, and recovery matter.
Not a fit
- Idea-only projects, equity-only work, and speculative MVPs with no budget.
- Simple API hookups or ordinary CRUD work that does not justify senior ownership.
- No access, no decision-maker, or a request to guess at production behavior from screenshots alone.
- The cheapest possible implementation regardless of verification or risk.
Faster implementation. Human accountability.
I use Codex and Claude Code extensively to accelerate investigation and implementation. I remain responsible for architecture, code review, test coverage, security, production access, rollout, rollback, and post-release verification.
Frequently asked
- Do I need a diagnostic first?
- No. If the problem and the required outcome are clear, I scope and quote the repair directly. The paid Integration Failure Diagnostic is for inherited systems, unclear causes, possibly-inconsistent data, or high production risk.
- What access do you need?
- Usually repository access, a safe test environment, relevant logs, and provider dashboards (Stripe, QuickBooks/ERP, cloud console), plus enough production context to verify behavior after release. Access is scoped at kickoff, and I never request secrets through ordinary messages.
- Can you fix historical data?
- Only after the affected records, source of truth, backup, and repair rules are agreed. Discovery establishes what is recoverable first — I do not promise complete recovery of unknown historical data up front.
- Do you work with AI-generated code?
- Yes. The relevant question is whether the system’s behavior, data boundaries, failure modes, deployment, and recovery are dependable — not how the first draft was produced.
- Do you offer ongoing support?
- When monitoring, incident response, integration changes, or operating responsibility justify it, I offer a defined support scope after the repair. It is optional, not a default retainer.
- Are you a SOC 2 auditor or penetration tester?
- No. The Cloud Controls service covers engineering remediation and evidence support for security reviews — not formal attestation, legal opinions, or a traditional pentest.
- How is the work priced?
- By scope, business consequence, access risk, and engagement shape — there is no universal price list. Well-defined repairs are quoted fixed-scope or by milestone; uncertain inherited systems start with a fixed-scope paid diagnostic or a capped weekly engagement.
- Will you change production directly?
- Not without agreed scope, access, backup, and rollback assumptions. Data repair and backfills run only within an explicitly approved plan, and every engagement has a stated system boundary and acceptance criteria.
- Can you take over the whole backend afterwards?
- Integration repair often leads to broader backend, data, infrastructure, or support work once trust is established. That follow-on work is scoped separately — the repair itself stays bounded.
Tell me what is failing, what it affects, and what “fixed” needs to mean.
I'll take the call myself. 15 minutes. Clear yes or no after.