Sezzle

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 to migrate to v2.

GitHub

Documentation

📖
Documentation
https://docs.sezzle.com/docs/api/v1/v1

Other Resources

🔗
Sandbox
https://sandbox.gateway.sezzle.com/v1
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/sezzle/refs/heads/main/apis.yml

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API entry from apis.yml

apis.yml Raw ↑ 
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: ''