Sezzle website screenshot

Sezzle

Sezzle is a buy-now-pay-later platform that enables merchants to offer installment payment options at checkout. Its REST APIs support merchant checkout integration, order management, shopper authentication, customer tokenization, and payment installment processing — allowing shoppers to split purchases into four interest-free payments over six weeks.

Sezzle publishes 7 APIs on the APIs.io network, including Bearer Authentication API, Customer API, Order API, and 4 more. Tagged areas include Buy Now Pay Later, BNPL, Payments, Installments, and Fintech.

The Sezzle catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Sezzle’s developer surface includes authentication, developer portal, GitHub presence, pricing, terms of service, privacy policy, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub
44.5/100 developing ▬ flat Agent 34/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessPaidSelf serve
8 APIs
Buy Now Pay LaterBNPLPaymentsInstallmentsFintechMerchant IntegrationCheckout

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 44.5/100 · developing
Contract Quality 15.9 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 0.7 / 13
Governance 7.0 / 12
Discoverability 7.4 / 10
Agent readiness — 34/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/sezzle: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 8

Individual APIs this provider publishes, each with its own machine-readable definition.

Sezzle API v1

The legacy Sezzle v1 API for merchants. Supports checkout creation and order completion via redirect-based flow. Deprecated in favor of v2; existing integrations are encouraged ...

Sezzle Bearer Authentication API

The Bearer Authentication API from Sezzle — 1 operation(s) for bearer authentication.

Sezzle Customer API

The Customer API from Sezzle — 4 operation(s) for customer.

Sezzle Order API

The Order API from Sezzle — 7 operation(s) for order.

Sezzle Reports API

The Reports API from Sezzle — 4 operation(s) for reports.

Sezzle Session API

The Session API from Sezzle — 2 operation(s) for session.

Sezzle Token API

The Token API from Sezzle — 2 operation(s) for token.

Sezzle Webhooks API

The Webhooks API from Sezzle — 3 operation(s) for webhooks.

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Sezzle Context

12 classes · 60 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Sezzle API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 8

Standalone JSON Schema definitions for this provider's data models.

Address

8 properties

JSON SCHEMA

Customer

8 properties

JSON SCHEMA

Discount

2 properties

JSON SCHEMA

LineItem

4 properties

JSON SCHEMA

Order

9 properties

JSON SCHEMA

Payout

0 properties

JSON SCHEMA

Price

2 properties

JSON SCHEMA

Webhook

2 properties

JSON SCHEMA

Scroll for all 8

Examples 7

Example request and response payloads for these APIs.

Authentication Request

2 fields

EXAMPLE

Authentication Response

3 fields

EXAMPLE

Capture Request

1 fields

EXAMPLE

Refund Request

2 fields

EXAMPLE

Session Request

4 fields

EXAMPLE

Session Response

4 fields

EXAMPLE

Webhook Create Request

2 fields

EXAMPLE

Scroll for all 7

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sezzle Authentication

apiKey · 1 scheme

SECURITY

Sezzle Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Sezzle Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Sezzle Agentic Access

27 operations · 15 acting

27 operations · 15 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal
Portal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 7

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub
 SDKNode
SDKNode
 SDKAndroid
SDKAndroid
 SDKiOS
SDKiOS
 IntegrationMagento2
IntegrationMagento2
 IntegrationWooCommerce
IntegrationWooCommerce
 IntegrationShopify
IntegrationShopify

Scroll for all 7

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

MerchantSupport
MerchantSupport

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Terms
Terms
 Privacy
Privacy

Other 1

Properties that don't map to a standard resource type

Dashboard
Dashboard

Source (apis.yml)

apis.yml Raw ↑ 
name: Sezzle
description: Sezzle is a buy-now-pay-later platform that enables merchants to offer installment payment options at checkout.
  Its REST APIs support merchant checkout integration, order management, shopper authentication, customer tokenization, and
  payment installment processing — allowing shoppers to split purchases into four interest-free payments over six weeks.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sezzle.png
url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/apis.yml
version: '0.19'
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
tags:
- Buy Now Pay Later
- BNPL
- Payments
- Installments
- Fintech
- Merchant Integration
- Checkout
apis:
- name: Sezzle API v1
  description: The legacy Sezzle v1 API for merchants. Supports checkout creation and order completion via redirect-based
    flow. Deprecated in favor of v2; existing integrations are encouraged to migrate to v2.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.sezzle.com/docs/api/v1/v1
  baseURL: https://gateway.sezzle.com/v1
  tags:
  - Payments
  - Checkout
  - Legacy
  properties:
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/v1/v1
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v1
  contact:
  - FN: Sezzle Merchant Support
    url: https://merchant-help.sezzle.com
    email: ''
- aid: sezzle:sezzle-bearer-authentication-api
  name: Sezzle Bearer Authentication API
  description: The Bearer Authentication API from Sezzle — 1 operation(s) for bearer authentication.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Bearer Authentication
  properties:
  - type: OpenAPI
    url: openapi/sezzle-bearer-authentication-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-customer-api
  name: Sezzle Customer API
  description: The Customer API from Sezzle — 4 operation(s) for customer.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Customer
  properties:
  - type: OpenAPI
    url: openapi/sezzle-customer-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-order-api
  name: Sezzle Order API
  description: The Order API from Sezzle — 7 operation(s) for order.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Order
  properties:
  - type: OpenAPI
    url: openapi/sezzle-order-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-reports-api
  name: Sezzle Reports API
  description: The Reports API from Sezzle — 4 operation(s) for reports.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/sezzle-reports-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-session-api
  name: Sezzle Session API
  description: The Session API from Sezzle — 2 operation(s) for session.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Session
  properties:
  - type: OpenAPI
    url: openapi/sezzle-session-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-token-api
  name: Sezzle Token API
  description: The Token API from Sezzle — 2 operation(s) for token.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Token
  properties:
  - type: OpenAPI
    url: openapi/sezzle-token-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
- aid: sezzle:sezzle-webhooks-api
  name: Sezzle Webhooks API
  description: The Webhooks API from Sezzle — 3 operation(s) for webhooks.
  humanURL: https://docs.sezzle.com/docs/api/intro
  baseURL: https://gateway.sezzle.com/v2
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/sezzle-webhooks-api-openapi.yml
  - type: Documentation
    url: https://docs.sezzle.com/docs/api/intro
  - type: Sandbox
    url: https://sandbox.gateway.sezzle.com/v2
  - type: Authentication
    url: https://docs.sezzle.com/docs/api/intro
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/finops/finops.yml
common:
- type: AgenticAccess
  url: agentic-access/sezzle-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/sezzle-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/sezzle-domain-security.yml
- type: Authentication
  url: authentication/sezzle-authentication.yml
- type: Portal
  url: https://docs.sezzle.com/
- type: Dashboard
  url: https://dashboard.sezzle.com/merchant
- type: MerchantSupport
  url: https://merchant-help.sezzle.com
- type: GitHub
  url: https://github.com/sezzle
- type: SDKNode
  url: https://github.com/sezzle/sezzle-node
- type: SDKAndroid
  url: https://github.com/sezzle/sezzle-merchant-sdk-android
- type: SDKiOS
  url: https://github.com/sezzle/sezzle-merchant-sdk-ios
- type: IntegrationMagento2
  url: https://github.com/sezzle/sezzle-magento2
- type: IntegrationWooCommerce
  url: https://docs.sezzle.com/
- type: IntegrationShopify
  url: https://apps.shopify.com/sezzle-payments
- type: Pricing
  url: https://sezzle.com/pricing
- type: Terms
  url: https://sezzle.com/terms-of-service
- type: Privacy
  url: https://sezzle.com/privacy-policy
maintainers:
- FN: API Evangelist
  url: https://apievangelist.com
  email: kin@apievangelist.com