The LifterLMS REST API and Webhooks: A Practical Introduction
Create an API key, make your first authenticated request to /wp-json/llms/v1, and set up a signed webhook. Then choose between webhooks, polling and…
Read article"Can LifterLMS do this?" has four possible answers: it already does, there is an add-on, a few lines of code will do it, or it needs a plugin of its own. Those answers differ a lot in cost and in how much you maintain afterward, so it pays to find the lightest one that fits.
This guide is for the owner or manager making that call, and for the developer who has to recommend one. It walks the options in order, lists the signs that you have outgrown the lighter ones, and describes what a custom plugin project involves.
There are no prices here, because scope decides them. What you get is a way to tell which of the four you need.
One option sits between rungs two and three. LifterLMS webhooks can send enrollment, progress and order events to an automation tool with no code on your site. If the need is "tell another system when this happens", look at the available LifterLMS integrations before commissioning anything.
One signal is not enough. Two or three together usually are.
| Factor | Add-on or snippet | Custom plugin |
|---|---|---|
| Time to a working feature | Short | Longer: discovery, build and testing |
| Fit to your process | You adapt to the tool | Built around how you operate |
| Who maintains it | The vendor (add-on) or you (snippet) | You or your developer, for as long as it runs |
| Compatibility with LifterLMS updates | The vendor's job for an add-on | Your job: test against each release |
| Data structure | Whatever the tool chose | Designed for your reporting |
| Main risk | The tool changes direction or stops being maintained | Unclear requirements and neglected upkeep |
| Best when | The need is common | The need is specific to your business |
Write the rules in plain language before anyone writes code. Include the awkward cases: refunds, expired access, a student who is unenrolled halfway through, a deleted user. The output is a short specification and a list of acceptance tests.
Decide where each piece of data lives. Values that describe one student in one course can use the LifterLMS user postmeta table through llms_update_user_postmeta() and llms_get_user_postmeta(). Profile-level values fit WordPress user meta. High-volume or relational data deserves its own indexed table. Plan exports and privacy erasure now, not after launch.
The plugin reacts to LifterLMS actions such as llms_user_enrolled_in_course and lifterlms_course_completed, and changes state through public functions such as llms_enroll_student(). External systems reach it through the LifterLMS REST API at /wp-json/llms/v1/ or through endpoints the plugin registers itself. Slow work, like calls to another service, belongs in background jobs. LifterLMS bundles Action Scheduler, so the queue is already there.
A minimal, safe starting point looks like this:
/**
* Plugin Name: Acme LMS Extensions
* Description: Custom LifterLMS functionality for Acme Academy.
* Version: 1.0.0
* Requires Plugins: lifterlms
*/
defined( 'ABSPATH' ) || exit;
add_action( 'plugins_loaded', 'acme_lms_boot' );
function acme_lms_boot() {
if ( ! function_exists( 'llms' ) ) {
return;
}
require_once __DIR__ . '/includes/enrollment-rules.php';
}
On WordPress 6.5 and later, the Requires Plugins plugin header tells WordPress that the plugin depends on LifterLMS, so it cannot be activated from the Plugins screen until LifterLMS is installed and active. The function_exists() check is the fallback: if LifterLMS is missing, your code does not load and nothing calls a function that does not exist.
Settings can live inside LifterLMS. A class that extends LLMS_Abstract_Integration and is registered through the lifterlms_integrations filter gets its own section under LifterLMS > Settings > Integrations. Reports and tools need their own screens, restricted with LifterLMS capabilities such as manage_lifterlms, because not every admin-area user should see student data.
Rules about money and access need automated tests. LifterLMS publishes the PHPUnit helper library its own test suite uses, lifterlms/lifterlms-tests, and a custom plugin can build on it. Add a short manual script for checkout and enrollment on staging.
A plugin is not finished at launch. Each LifterLMS release means reading the changelog, running the tests on staging and fixing any deprecation notices. Someone has to own that, and it should be agreed before the build starts. The wider workflow is covered in our LifterLMS development guide.
Write the requirement as one sentence that starts with "When a student...". List the data it needs and who has to see it. Then walk the ladder honestly, starting with settings.
If you land on the fourth rung, or cannot tell which rung you are on, get a second opinion before you build. Our LifterLMS consulting service helps you scope the requirement, LifterLMS plugin development covers the build, and you can send us your one-sentence requirement to start the conversation.
Create an API key, make your first authenticated request to /wp-json/llms/v1, and set up a signed webhook. Then choose between webhooks, polling and…
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LifterLMS development is WordPress development with extra rules: content lives in post types, student activity in custom tables, changes go through…
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Build one LifterLMS course from start to finish: the course post, Course Options, the outline, lesson content, a quiz, an access plan, publishing…
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