APPIE On Host

Gateway Abstraction & Multi-Processor Control

An API and control layer that sits in front of gateways and processors. Merchants integrate once while APPIE handles routing, translation, and migration across backend hosts—without merchant disruption or re-certification.

What is APPIE On Host?

APPIE On Host is a bank-grade payment interoperability layer that sits between merchants/ISVs and multiple backend payment hosts. It preserves legacy merchant contracts externally while handling routing, protocol translation, and safe migration internally.

Unlike a simple API gateway, APPIE On Host understands payment semantics. It classifies transaction types, manages session state, handles idempotency and duplicate suppression, and provides deterministic financial safety controls.

Key benefit: Merchants certify once to APPIE. When you need to change gateways, add processors, or retire legacy hosts, the migration happens entirely within APPIE—merchants never need to re-integrate or re-certify.

Safe Migration

Migration Modes

APPIE provides multiple migration modes to safely transition between gateways with varying levels of risk and validation.

Observe-Only

low risk

Traffic is observed and classified but not executed through the target host. Used to learn undocumented patterns and unknown message types without any risk.

Best for: Learning phase for new gateway integration

Shadow

low risk

Old host remains primary; new host is exercised invisibly for equivalence and latency comparison. Results are compared but not used for actual transactions.

Best for: Validation before any live traffic

Dual-Run

medium risk

Both hosts process the same flow for transaction-level comparison and discrepancy logging. Both results are captured and analyzed.

Best for: Deep validation of new host behavior

Canary

medium risk

A controlled percentage of live traffic shifts to the new host while the old host handles the remainder. Carefully monitored for issues.

Best for: Controlled production exposure

Phased

low risk

Merchant groups or traffic cohorts move in waves, usually by volume, complexity, or strategic importance.

Best for: Enterprise-scale migration

Coverage

Transaction Type Support

APPIE On Host supports 91+ transaction types across 9 major categories,with extensibility for custom requirements.

Credit Card

18 types

Sale, Auth-only, Verify, Return...

Debit

14 types

PIN purchase, PIN-less purchase, Pre-auth, Completion...

EBT

10 types

Food stamp purchase, Return, Balance, Cash benefit...

Check/ECS

6 types

Purchase, Verification, Guarantee, Void...

Gift Card

14 types

Activation, Sale, Credit, Replenish...

Loyalty

8 types

Add points, Redeem points, Balance, Batch close...

DCC

4 types

Rate request, Rate update, Sale, Refund...

Settlement/Admin

12 types

Auto close, Quick close, Normal settlement, Terminal-based close...

Specialized

5 types

IVU Loto regional flows, Canadian debit reversal, Region-specific message families...

Patent Pending Technology by RapidCents

Ready to Eliminate Payment Fragmentation?

Join leading payment processors, banks, and enterprise software vendors who are using APPIE to reduce integration costs, accelerate time-to-market, and gain strategic control over their payment infrastructure.

Request Enterprise Demo Access Secure Portal

Or email us directly at enterprise@appiepayments.com

Enterprise-Grade • Bank-Level Security • For Payment Companies Only