Expert Payment Consulting

Skip the hourly meter. Fixed-scope engagements with seasoned payments engineers — clear price, defined deliverable. Come with a hex dump, leave with an answer.

from $1,500
fixed-scope engagements

No hourly meter, no account managers. Pick the engagement that matches your problem and get a defined deliverable.

🎯 Fixed-Scope Offerings

🔐

Cryptography Debug Session

$1,500

Up to 2 hours, live, working your crypto issue alongside you. Come with a hex dump, leave with an answer.

In scope
  • ARQC / CAVV generation & validation
  • PIN blocks, PVV & IBM 3624 offsets
  • KCV, DUKPT key derivation
  • TR-31 key block issues
You provide
  • A hex dump or message trace
  • Test keys / vectors (redacted is fine)
  • Expected vs. actual output
Turnaround

Scheduled within 48 hours of payment; 2-hour live session.

Book Cryptography Session →
📡

ISO 8583 / EMV Integration Troubleshooting

$2,500

Fixed scope, async work plus one call. We trace the failure to its root and hand you written findings.

In scope
  • Parsing, bitmap & field-encoding errors
  • Host-to-host / connection issues
  • EMV TLV & cryptogram mismatches
You provide
  • Captured request / response messages
  • Spec or dialect in use
  • Where the flow breaks
Turnaround

Async start within 2 business days; one live call plus written findings.

Book Troubleshooting →
🏗️

Fixed-Scope Integration Audit

$5,000

A written review of your payment integration and a prioritized fix list, delivered within one week.

In scope
  • Configuration review
  • Message flow walkthrough
  • Crypto / key management review
  • Prioritized remediation list
You provide
  • Architecture & config summary
  • Sample message flows
  • Docs access (no prod access needed)
Turnaround

Written report within 1 week of kickoff.

Book Integration Audit →

🧭 How It Works

1
Pay Choose an engagement and pay by invoice or card. We confirm scope in one business day.
2
Schedule We book the live session or start the async review at a time that works across time zones.
3
Deliver You leave with an answer and/or written findings you can act on.

✨ Why Work With Us

⚡
Immediate Expertise — No onboarding. We've built payment systems for banks, processors, and FinTech unicorns.
🎯
Focused Sessions — Book a single fixed-scope engagement. Come with your hex dump, leave with answers.
🔒
NDA Ready — We understand payment data sensitivity. Secure screen sharing and encrypted communications.
🌍
Global Availability — We schedule across time zones. Your 2 AM deadline is our priority.

Not sure which engagement fits?

Email a one-paragraph description of your issue. We'll point you at the right fixed-scope offering and reply within one business day.

Contact Us

📧 sales@isofluent.com

IsoFluent provides engineering debugging assistance and self-directed tooling only — we never provide trade signals or investment advice.