Plugin
Updated
Newsletter API
Newsletter - API is a WordPress plugin by The Newsletter Team that adds a RESTful interface to the Newsletter plugin. It lets external systems such as CRMs, ecommerce stores and marketing automation tools add, update and remove subscribers through server-to-server requests.
Install this firstPlease install the Newsletter core Plugin from here before installing the addons
Go to product- Version
- 2.5.8
- Released
- Aug 30, 2026
- Developer
- Newsletter
- Type
- WordPress plugin
- Licence
- GPL
- Included in
- Every plan, or $0.79 a year on its own
What’s new in Newsletter API 2.5.8
Version 2.5.8
Latest
- ImprovedWP 7.1 check
What it does
If your subscribers come from more than one place, keeping the mailing list in sync by hand gets tedious and error prone. A customer signs up in your store, a lead lands in your CRM, and someone still has to copy that address into the newsletter. This add-on gives the Newsletter plugin a set of REST endpoints so those outside systems can write subscriber data directly, keeping lists accurate without manual exports and imports.
The API is aimed at developers and businesses building integrations. Requests are authenticated with API keys, and public access can be restricted so only authorized systems reach your data. You can set subscriber status, assign private lists, fill custom profile fields and trigger autoresponder sequences when someone joins a list. A single PUT call handles both inserts and updates, validation errors come back with clear messages, and documentation with code examples is available for reference.
Best for
- Developers connecting the Newsletter plugin to CRMs
- Online stores syncing customers to mailing lists
- Businesses automating subscriber sign-ups and autoresponders
Features
Subscriber management endpoints
Add, update or delete subscribers programmatically through REST endpoints, so external platforms can keep your Newsletter mailing lists in sync with their own records.
Server-to-server authentication
Requests are protected with API keys, and public access can be restricted so that only the systems you authorize can read or change subscriber data.
Subscriber status control
Set subscriber states such as confirmed, bounced or unsubscribed through the API, which helps keep your list clean and accurate over time.
Private lists and profile fields
Assign subscribers to private lists and fill in custom profile fields, giving you the data needed to segment your audience for targeted emails.
Autoresponder add-on triggers
Works with autoresponder add-ons so email sequences start automatically when a subscriber is added to a specific list through the API.
Single call insert or update
One idempotent PUT method creates a new subscriber or updates an existing one, which cuts down on extra calls and keeps integration code simpler.
Clear error handling
The API validates incoming data and returns clear feedback on invalid email addresses or conflicting subscriber records, reducing inconsistencies in your list.
Complete data removal
Permanently delete a subscriber along with all associated interaction statistics in an irreversible process, useful when handling data privacy requests.
Newsletter API older versions
- 2.5.7May 291 improvement
- 2.5.5Apr 161 improvement
- 2.5.2Mar 1
- 2.5.1Mar 17, 20251 new, 1 improvement
- 2.5.0Mar 10, 2025
- 2.4.8Jul 8, 2024
- 2.4.7Jun 13, 2024
- 2.4.6Jun 8, 2024
- 2.4.4May 29, 2024
- 2.4.2May 15, 2024
Members and buyers of this product can download older versions.
21 older versions in all. If you need one that is not listed, ask support.
Questions about Newsletter API
Does this work on its own or do I need the Newsletter plugin?
It is an add-on for the Newsletter plugin. It exposes the Newsletter plugin's subscriber features through a REST interface, so the main plugin handles your lists and emails while this API lets external systems interact with them.
Can I update an existing subscriber without checking whether they exist first?
Yes. The API offers an idempotent PUT method that adds a new subscriber if the email is not on file and updates the existing record if it is, so your integration does not need a separate lookup step.
How is subscriber data kept secure?
The API uses server-to-server authentication with API keys, and you can restrict public access. Only systems holding valid credentials can add, change or delete subscribers, which keeps your list data away from unauthorized requests.
Can I fully remove a subscriber for privacy requests?
Yes. A delete request permanently removes the subscriber and all of their associated interaction statistics. The process is irreversible, which suits situations where you need to honor data privacy regulations.
Is Newsletter API free?
The code of Newsletter API is licensed under the GPL, so anyone may use, change and share it. GPL Feast is a paid service: a plan or a single purchase gives you the download and automatic updates. The developer's own support, licence key and online services are not included.
Which version of Newsletter API is this?
Version 2.5.8, released Aug 30, 2026. New versions appear here when the developer publishes them, and members get them as automatic updates.
How do I update Newsletter API?
Install the free GPL Feast Updater on your site and connect it with your API key. It installs new versions of Newsletter API automatically and keeps a backup, so you can roll back.
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