# Session Discount Injector

*/Software/Session_Discount_Injector*

## Solution Overview

Session Discount Injector is a headless API that generates and inserts single-use, cryptographically signed promo codes directly into active e-commerce sessions. It evaluates real-time cart state, time-to-checkout, and cursor velocity to calculate the minimum viable discount required to convert a wavering buyer. The system outputs a temporal JSON payload containing a dynamic discount percentage, an ephemeral code tied strictly to the shopper session ID, and a sub-minute expiration timestamp.

E-commerce engineering teams integrate this primitive to halt margin erosion caused by static coupons leaking to aggregator networks like RetailMeNot. By replacing hardcoded promotions with session-locked incentives, the API ensures full-price buyers never see unnecessary markdowns while intercepting likely abandonments with precise dollar-off or percentage triggers.

The API sits between real-time data pipelines and the presentation layer, ingesting live clickstream events from Segment and base product costs from inventory databases to calculate maximum allowable customer acquisition costs on the fly. It is queried directly by headless storefronts and checkout-recovery agents, which apply the finalized discount token to the cart payload just before the payment gateway processes the transaction.

## Api Definition

**Protocols**:
- REST
- SDK
- MCP
- Webhooks
**Consumed By**:
- [Checkout Recovery Agent](/Agents/Checkout_Recovery_Agent)
- [Conversion Optimization Agent](/Agents/Conversion_Optimization_Agent)
- [Dynamic Pricing Agent](/Agents/Dynamic_Pricing_Agent)
**Integrations**:
- [Segment](/Products/Segment)
- [Shopify](/Products/Shopify)
- [Commercetools](/Products/Commercetools)
- [Stripe](/Products/Stripe)
**Consumption Model**: A conversion agent registers the MCP server to stream cart events, calling calculate_discount to inject a session-locked promo code via REST when purchase velocity stalls.
**Workflow Wrappers**:
- Name: Generate Session Discount · Wraps: evaluates real-time cart velocity, calculates minimum viable discount, and issues an ephemeral session-locked token
- Name: Validate Checkout Token · Wraps: verifies the cryptographic signature, session ID binding, and expiration timestamp before authorizing the transaction

## Api Function Cascade

**Ai Role**: AI runs entirely unattended within this primitive's execution loop, evaluating cart velocity and predicting abandonment risk to trigger deterministic discount calculations and token injections without human intervention.
**Cascade**:
- Kind: Code · Note: Subscribes to session events from Segment and Shopify · Step: Ingest Cart Velocity Stream · Verb: ingest · Realizes: Monitor Real-Time Data · Oversight: none
- Kind: Generative · Note: Scores drop-off probability based on dwell time and cart value · Step: Predict Abandonment Risk · Verb: evaluate · Realizes: Analyze Consumer Behavior · Oversight: none
- Kind: Code · Note: Applies margin rules to find the lowest effective incentive · Step: Calculate Viable Discount · Verb: calculate · Realizes: Determine Pricing Strategy · Oversight: none
- Kind: Code · Note: Issues a cryptographically signed, session-locked promo code · Step: Generate Ephemeral Token · Verb: generate · Realizes: Manage Cryptographic Keys · Oversight: none
- Kind: Code · Note: Pushes the token back to the storefront via REST · Step: Inject Checkout Discount · Verb: update · Realizes: Process E-Commerce Transactions · Oversight: none
**Optimizes**:
- [Cart Abandonment Rate](/Metrics/Cart_Abandonment_Rate)
- [Checkout Conversion Rate](/Metrics/Checkout_Conversion_Rate)
- [Discount Margin Retention](/Metrics/Discount_Margin_Retention)
- [Session Revenue Yield](/Metrics/Session_Revenue_Yield)

## Headless Saas Representative Offer

**Warranty**: Guarantees sub-50ms latency on discount calculation and 99.9% uptime on the validation endpoint, with service credits applied for missed SLAs.
**Price Band**: Roughly $0.01 to $0.05 per generated session discount token, depending on monthly API call volume commitments.
**Pricing Kind**: UsageMeter
**Deliverables**:
- Real-time cart event evaluation stream
- Cryptographically signed, ephemeral discount tokens
- Checkout validation endpoint for session ID binding
- MCP server configuration for agentic workflow registration
**Delivery Mode**: Self-serve API access where developers or autonomous agents instantly provision credentials, register the MCP server, and begin streaming cart events.
**Business Function**: ProvideService
**Agent Checkout Support**:
- agentic-commerce-protocol
- stored-credential

## Headless Saas Crud Surface

**Auth Model**: API Key
**Endpoints**:
- GET /sessions — list active browsing sessions
- POST /sessions — create a new session context
- GET /sessions/{id} — fetch session details
- PATCH /sessions/{id} — update session context
- GET /rules — list active discount injection rules
- POST /rules — create a new discount rule
- GET /rules/{id} — fetch a specific discount rule
- PATCH /rules/{id} — update a discount rule
- GET /sessions/{id}/injections — list discounts injected into a session
- POST /sessions/{id}/injections — manually inject a discount into a session
- GET /sessions/{id}/injections/{injectionId} — fetch details of a specific injected discount
- DELETE /sessions/{id}/injections/{injectionId} — remove an injected discount from a session
- POST /sessions/{id}/evaluate — evaluate active rules and auto-inject applicable discounts
**Multitenancy**: Row-level isolation
**Webhook Events**:
- session.evaluated
- injection.applied
- injection.rejected

## Headless Saas Erd

```mermaid
erDiagram
    Workspace {
        UUID id PK "tenant"
        VARCHAR name
        VARCHAR status
    }
    DiscountRule {
        UUID id PK
        UUID workspaceId FK
        VARCHAR name
        VARCHAR conditionType
        DECIMAL discountValue
        BOOLEAN isActive
    }
    ActiveSession {
        UUID id PK
        UUID workspaceId FK
        VARCHAR sessionId
        DECIMAL cartTotal
        TIMESTAMP expiresAt
    }
    AppliedDiscount {
        UUID id PK
        UUID workspaceId FK
        UUID activeSessionId FK
        UUID discountRuleId FK
        DECIMAL appliedAmount
    }
    Workspace ||--o{ DiscountRule : configures
    Workspace ||--o{ ActiveSession : tracks
    Workspace ||--o{ AppliedDiscount : records
    ActiveSession ||--o{ AppliedDiscount : receives
    DiscountRule ||--o{ AppliedDiscount : yields
```

## Neighborhood

### Who offers this

- [Aband](/Startups/Aband) — offers · Startups

### Optimizes

- [Cart Abandonment Rate](/Metrics/Cart_Abandonment_Rate) — optimizes · Metrics
- [Checkout Conversion Rate](/Metrics/Checkout_Conversion_Rate) — optimizes · Metrics
- [Discount Margin Retention](/Metrics/Discount_Margin_Retention) — optimizes · Metrics
- [Session Revenue Yield](/Metrics/Session_Revenue_Yield) — optimizes · Metrics

### What it uses

- [Segment](/Products/Segment) — uses · Products
- [Shopify](/Software/Shopify) — uses · Software
- [Stripe](/Software/Stripe) — uses · Software
- [Commercetools](/Products/Commercetools) — uses · Products

### Who consumes this

- [Checkout Recovery Agent](/Agents/Checkout_Recovery_Agent) — consumed by · Agents
- [Conversion Optimization Agent](/Agents/Conversion_Optimization_Agent) — consumed by · Agents
- [Dynamic Pricing Agent](/Agents/Dynamic_Pricing_Agent) — consumed by · Agents

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