Power-Up Your Business
Application Programming Interface (API)
Leverage the Power of LetterStream’s API
Expand Your Product Offerings and/or Automate Your Current Workflow
Easy Activation:
Our API has been activated in less than a day by some of our integration partners, making it an easy win for your development team and providing a no-miss ROI on your time.
Utilized by Many:
Our API has successfully sent everything from a single piece of mail to millions.
API Calls:
Our API does more than send mail. With calls for price checks, proofing, tracking, mailing status, and delivery status for premium products, it provides the tools needed to manage mail from start to finish.
- List of Calls
- Send one letter or a batch of thousands
- Send letters, postcards, Certified Mail, and Flats
- Get a price check
- Retrieve PDF proofs
- Get the mailing status
- Get tracing information for Certified Mail
- Retrieve Certified Mail signature
- Specify return envelopes
- Dictate the paper color for your documents
Simple Activation
Create an account and send an email to support with your user name requesting API access (support@letterstream.com)
Who Uses Our API?
- Accounting, billing, property management, and HOA applications have successfully automated invoices, statements, and recurring mail.
- Marketing and business platforms have expanded their applications with integrated print and mail capabilities.
- Legal, healthcare, and insurance applications have streamlined important customer and client communications.
- Enterprise and high-volume mail operations have automated recurring mailings and reduced manual processing.
The API May Not Be the Answer You Need.
If your goal is simply to get mail out the door quickly, you may not need an API at all.
With LetterStream’s online platform, you can create and send most mailings in 2 minutes or less, with no integration, development work, or API subscription required.
Try Our Web Portal Instead
Most new users spend 15 minutes or less creating their first mailing. In the time it could take to activate and configure an API, you could already be sending thousands of pieces through our online platform.
Upload your documents, choose your mailing options, and submit. It’s that fast and that easy!
Create a free account to get started.
Automate Your Process
Our API automates the process of getting your mail produced and sent, and can integrate with any platform that generates documents for mailing, even in industries not listed above.
Choose Your Mode
Understand LetterStream’s API Options
- Simplify the process for your customers to send mail
- Our API allows you to push documents to your client’s LetterStream dashboard.
- Support and billing handled by LetterStream
- Earn income from the print and mail process
- Maximize the benefits to your users and earn revenue
- Set your own prices
- LetterStream is hidden in the background
- Monetize your mail forms
- Automate your internal process of sending mail
- We become your in-house virtual mail room
- Send one or thousands
Partnership
- You are looking for a print-to-mail solution to enhance your capabilities
- LetterStream controls the billing relationship with your customer
- LetterStream controls the pricing to your customer
- LetterStream supports the customer service relationship
- The user pays for printing-and-mailing through LetterStream’s online portal
- You simplify the loading of jobs into your customer’s LetterStream account
- LetterStream prints and mails the customers documents
Automation
- You are wanting to automate printing-and-sending mail
- You want to reduce staff, headaches, or supply chain management
- You want LetterStream to bill your organization
- You are LetterStream’s customer
- You are supported by LetterStream’s customer care team
- Documents may come from one or many divisions within your organization, but are sent to LetterStream from your organization only (no external customer)
Monetization
- You are looking to monetize print-to-mail from your customer
- You control billing relationship with your customer, while LetterStream bills you
- You control pricing to your customer
- LetterStream doesn’t know your customer
- You provide your customers with customer service and/or all help
- You push your documents to LetterStream for print-to-mail
- LetterStream Prints and mails the documents
Partnership Mode
Businesses use Partnership Mode to offer their customers a reliable print-to-mail solution without taking on the operational work themselves. Your customers send documents through their own LetterStream accounts, while we handle billing, customer service, printing, and mailing. Your solution simplifies how jobs get into LetterStream, giving your customers direct access to proven print-and-mail capabilities without adding overhead to your business.
- Devote less internal resources (time, staff, cost) to non-revenue generating processes (cost center) — outsource the print and mail process
- Streamline the print and mail process across multiple business centers
- Control costs and increase accountability
- Offer solutions you would not otherwise have without adding overhead
- Allow LetterStream to handle the customer care relationship
- LetterStream handles the billing process
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Automation Mode
Organizations use Automation Mode to automate high-volume mail and reduce the work of managing it internally. Whether mail comes from one department or several, documents move directly from your systems to LetterStream through our API. We handle the printing and mailing, bill your organization directly, and provide ongoing support—giving you a streamlined way to manage outbound mail without maintaining an internal mailroom.
- Remove humans from sending process
- Send unlimited quantities (with no minimum)
- Activity reporting at account level
- Leverage the power of StreamLogic while replacing your mailroom
Monetization Mode
Businesses use Monetization Mode to offer print-and-mail services under their own brand while LetterStream works behind the scenes. You maintain control of your customer relationships, including pricing, billing, and support, while our API sends documents to LetterStream for printing and mailing. Your customers remain your customers, giving you a proven way to add print-and-mail capabilities without building or managing the production infrastructure yourself.
- Looking to monetize a current print and mail process
- Maximize benefits to users and earn revenue at the same time
- You control client-side billing relationship
- Your customer does not know LetterStream exists
- You control pricing
- Fully automated bi-directional integration
Simple Activation
Create an account and send an email to support with your user name requesting API access (support@letterstream.com)
Frequently Asked Questions
What is the LetterStream API?
Application Programming Interface (API): APIs are mechanisms that enable two software components to communicate with each other using a set of definitions and protocols.
The LetterStream API lets approved customers programmatically submit mailings from their own software instead of using our website. It’s meant for higher-volume and automated workflows.
Do I Have to Have an API to Send Mail Through LetterStream?
No. You can send mail directly through the LetterStream web portal with no monthly fee or minimum. Our API is designed for businesses that want to integrate LetterStream into their existing software or automate their mailing workflow.
Is the LetterStream API right for me?
We’ll help confirm whether the API is the best solution for your use case, since many customers find the website faster for lower-volume or ad-hoc mailings. The API shines when you need automation, scale, and deeper integration.
How do I qualify for API access?
Start by creating your free LetterStream account, then email support from the email address on you used to sign-up. Provide a quick overview of your company, what you want to send, estimated volume/frequency, and which API mode fits your ideal needs. You’ll also need a developer (in-house or contracted) to implement the integration, and your system must be able to generate PDFs (and recipient data via CSV) for submission. Once reviewed and approved, we enable API access and share the documentation docs to get you started.
Do you offer different API modes?
- LetterStream supports three API modes:
Automation Mode
- Use LetterStream to automate and speed up your organization’s own mailings. It’s the simplest and fastest mode to implement.
Monetization Mode
- Resell LetterStream-powered mailings under your brand. You control pricing, billing, and customer support, while LetterStream stays behind the scenes and processes everything through your master account.
Partnership Mode
- Integrate your own software with LetterStream so your customers send mail from their own LetterStream accounts. Customers create their own LetterStream account under your unique partner link, pay LetterStream directly, and receive LetterStream support for LetterStream-related matters—while you handle setup and software-related help. This is the most complex option to set up.
What file types does the API support?
The API system works with PDF documents and CSV address files. Your software should be able to generate PDFs to send to us.
Are API mailings processed automatically when I submit them?
Not quite—jobs can be submitted via API, but they won’t be processed until they’re paid for. Payment is still required before production begins. You can pre-fund your account to ensure smooth entry of mailings into our production queue.
Do I need a developer to use the API?
Yes. You’ll need either an in-house developer or someone contracted to implement the integration on your side.
Does the API return status and error responses I need to handle?
Yes. API Partners are expected to capture and programmatically handle all API responses (success or failure). This helps avoid situations where a sender thinks a job was submitted when it wasn’t received.
What happens after I’m approved?
Once we confirm your mode and requirements, we enable API access for your account (including test) and share documentation plus next steps to go live.
