LetterStream API Information

Getting Started

LetterStream offers an API for tech-savvy businesses looking to automate their mailing workflows. This guide outlines the API’s capabilities, available modes, and how to get started based on your integration goals.

In This Article

• General Requirements
• Supported Mail Types
• API Modes
• API Activation Process

General Requirements

To use the LetterStream API, here are a few things to keep in mind:

• Your system must be able to generate PDF and CSV files
• Mailings are not processed until paid for
• Use the PrePay option and enable a Low Balance Alert for a seamless experience
• A developer is required—whether in-house or contracted—to complete the integration

Supported Mail Types

The API supports:

• USPS First-Class Mail (optional “Homeowner Statement Enclosed” endorsement)
• Certified Mail (with or without Electronic Return Receipt)
• Flats
• Postcards

API Modes

Choose the mode that best fits your goals:

Automation Mode

• Best for internal use to automate and speed up your own mail processes
• Easiest and quickest to implement
• LetterStream continues to provide all platform support

Monetization Mode

• Allows you to sell LetterStream services to your customers
• You manage pricing, billing, and customer support
• LetterStream will have no relationship with your customers
• Customer mailings are processed under your master account

Partnership Mode

• Your customers create their own accounts via your special partner link
• Customers pay LetterStream directly at standard prices
• LetterStream supports customers using the platform
• You assist customers with account setup and integration

API Activation Process

• The API is not enabled by default
• Email LetterStream to discuss your needs and confirm API suitability
• Once approved, access API documentation under the My Account tab
• Integration must be handled by your developer—LetterStream does not implement it for you

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