diff --git a/README.md b/README.md
index 35dc180..ca53fd4 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ $ ember install ember-stripe-elements
 
 You must set your [publishable key](https://support.stripe.com/questions/where-do-i-find-my-api-keys) in `config/environment.js`.
 
+
 ```js
 ENV.stripe = {
   publishableKey: 'pk_thisIsATestKey'
@@ -89,6 +90,12 @@ export default Route.extend({
 });
 ```
 
+You can also pass `publishableKey` to the `load` function.
+
+```js
+this.get('stripe').load('pk_thisIsATestKey');
+```
+
 ## Components
 
 ### Basics
diff --git a/addon/services/stripev3.js b/addon/services/stripev3.js
index df0a01e..67e1654 100644
--- a/addon/services/stripev3.js
+++ b/addon/services/stripev3.js
@@ -4,6 +4,7 @@ import { getProperties, setProperties } from '@ember/object';
 import { readOnly } from '@ember/object/computed';
 import { resolve } from 'rsvp';
 import loadScript from 'ember-stripe-elements/utils/load-script';
+import EmberError from '@ember/error';
 
 // As listed at https://stripe.com/docs/stripe-js/reference#the-stripe-object
 const STRIPE_FUNCTIONS = [
@@ -30,20 +31,24 @@ export default Service.extend({
 
   lazyLoad: readOnly('config.lazyLoad'),
   mock: readOnly('config.mock'),
-  publishableKey: readOnly('config.publishableKey'),
+  publishableKey: null,
 
   init() {
     this._super(...arguments);
+    this.set('publishableKey', this.get('config.publishableKey'))
 
     let lazyLoad = this.get('lazyLoad');
-    let mock = this.get('mock');
 
-    if (!lazyLoad || mock) {
+    if (!lazyLoad) {
       this.configure();
     }
   },
 
-  load() {
+  load(publishableKey = null) {
+    if (publishableKey) {
+      this.set('publishableKey', publishableKey);
+    }
+
     let lazyLoad = this.get('lazyLoad');
     let mock = this.get('mock');
     let shouldLoad = lazyLoad && !mock
@@ -62,6 +67,9 @@ export default Service.extend({
     if (!didConfigure) {
       let publishableKey = this.get('publishableKey');
 
+      if (!publishableKey) {
+        throw new EmberError("stripev3: Missing Stripe key, please set `ENV.stripe.publishableKey` in config.environment.js");
+      }
 
       let stripe = new Stripe(publishableKey);
       let functions = getProperties(stripe, STRIPE_FUNCTIONS);
diff --git a/app/initializers/ember-stripe-elements.js b/app/initializers/ember-stripe-elements.js
index bf72b5e..4f27973 100644
--- a/app/initializers/ember-stripe-elements.js
+++ b/app/initializers/ember-stripe-elements.js
@@ -1,4 +1,3 @@
-import EmberError from '@ember/error';
 import config from '../config/environment';
 import StripeMock from 'ember-stripe-elements/utils/stripe-mock';
 
@@ -9,10 +8,6 @@ export function initialize() {
   application.register('config:stripe', stripeConfig, { instantiate: false });
   application.inject('service:stripev3', 'config', 'config:stripe');
 
-  if (!stripeConfig.publishableKey) {
-    throw new EmberError("stripev3: Missing Stripe key, please set `ENV.stripe.publishableKey` in config.environment.js");
-  }
-
   if (typeof FastBoot !== 'undefined' || stripeConfig.mock) {
     window.Stripe = StripeMock;
   }
diff --git a/tests/acceptance/publishable-key-test.js b/tests/acceptance/publishable-key-test.js
deleted file mode 100644
index a3e5807..0000000
--- a/tests/acceptance/publishable-key-test.js
+++ /dev/null
@@ -1,16 +0,0 @@
-import { module, test } from 'ember-qunit';
-import config from 'dummy/config/environment';
-import startApp from '../helpers/start-app';
-
-module('Acceptance | Publishable Key');
-
-test('it throws an error if config.stripe.publishableKey is not set', function(assert) {
-  let originalKey = config.stripe.publishableKey;
-  config.stripe.publishableKey = undefined;
-
-  assert.expectAssertion(function() {
-    startApp();
-  }, /Missing Stripe key/);
-
-  config.stripe.publishableKey = originalKey;
-});
diff --git a/tests/unit/services/stripev3-test.js b/tests/unit/services/stripev3-test.js
index 1207720..ccedb59 100644
--- a/tests/unit/services/stripev3-test.js
+++ b/tests/unit/services/stripev3-test.js
@@ -212,4 +212,28 @@ module('Unit | Service | stripev3', function(hooks) {
     confirmSetupIntent(mockOptions);
     confirmSetupIntent.restore();
   });
+
+  test('it throws an error if config.stripe.publishableKey is not set', function(assert) {
+    assert.expectAssertion(() => {
+      this.owner.factoryFor('service:stripev3').create({
+        config: {
+          mock: true,
+          publishableKey: null
+        }
+      });
+    }, /Missing Stripe key/);
+  });
+
+  test('it does not throw when publishableKey is provided by load method', async function(assert) {
+    this.subject = this.owner.factoryFor('service:stripev3').create({
+      config: {
+        mock: true,
+        lazyLoad: true,
+        publishableKey: null
+      }
+    });
+
+    await this.subject.load('some-key');
+    assert.ok(this.subject.get('didConfigure'), 'should have configured')
+  });
 });