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
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API Calls: With calls to send mail as well as price checks, proofing, tracking, mailing status, and delivery status for premium products, our API is complete not just for sending mail, but for monitoring it as well.
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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.
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Utilized by Many: Our API is simple enough to send one piece of mail, but powerful enough for sending millions.
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Simple Activation: Activation is simple. Sign up for a LetterStream account and then request API access from our support team via email (support@LetterStream.com). Be sure to tell us about your company or solution so we can fine-tune our response back.
- – List of Calls
- – Send one letter or a batch
- – Send letters, postcards, Certified Mail, and Flats
- – Get a price quote
- – Retrieve a PDF proof
- – Get the status of a mailing
- – Get the tracking information from a Certified Letter
- – Retrieve the Certified Mail signature
- – Specify return envelopes
- – Dictate the paper color for your documents
Who Uses Our API?
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Any software or application that generates invoices or statements would be a great candidate. This might be accounting software, accounts receivable automation software, billing software, property management and homeowner association applications.
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Software that generates non-billing correspondence. This might be marketing automation software, credit repair software, real estate marketing letters.
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Applications that run legal or medical practices where written and printed communications are generated within the platform.
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Automate Your Process
Because our API automates the process of getting mail produced and mailed, we can tie into any platform that produces a document for mailing, even industries that we have not listed.
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
- Automate your internal process of sending mail
- We become your in-house virtual mail room
- Send one or thousands
- 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
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
The Partnership mode is ideal for businesses that want to send their customer’s documents to LetterStream, while we handle everything else — from billing to customer service. Your solution simplifies the loading of jobs into your customer’s LetterStream account. Your customers interact directly with us, and you benefit by offering them access to a reliable, on-demand print-and-mail platform without internal overhead.
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Devote less internal resources (time, staff, cost) to non-revenue generating processes (cost center) — outsource the print and mail process
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Streamline the print and mail process across multiple business centers
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Control costs and increase accountability
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Offer solutions you would not otherwise have without adding overhead
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Allow LetterStream to handle the customer care relationship
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LetterStream handles the billing process
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Automation Mode
The Automation path is for companies that want to outsource their internal mail operations. Whether it’s an enterprise with multiple departments or a platform that generates high volumes of outbound mail, these customers use the LetterStream API to send documents to us for printing and mailing — and we bill them directly. We act as their mailroom and manage support, ensuring a hands-off experience after integration.
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Remove humans from sending process
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Send unlimited quantities (with no minimum)
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Activity reporting at account level
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Leverage the power of StreamLogic while replacing your mailroom
Monetization Mode
With Monetization, your business remains front and center. You use the LetterStream API behind the scenes, but maintain full control over your customer relationship — including pricing, billing, and support. We never interact with or even see your end users. This mode is perfect for platforms or SaaS companies looking to offer mail services under their own brand while using LetterStream as the engine behind the scenes.
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Looking to monetize a current print and mail process
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Maximize benefits to users and earn revenue at the same time
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You control client-side billing relationship
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Your customer does not know LetterStream exists
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You control pricing
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Fully automated bi-directional integration
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Need Help Sending Larger Corporate Mailings?
We Make Mailing a Breeze!
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.
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.
