convertkit / includes / functions.php

functions.php in Kit (formerly ConvertKit) – Email Newsletter, Email Marketing, Membership, Subscribers and Landing Pages 3.3.9, at includes/functions.php

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1	<?php
2	/**
3	* ConvertKit general plugin functions.
4	*
5	* @package ConvertKit
6	* @author ConvertKit
7	*/
8
9	/**
10	* Runs the activation and update routines when the plugin is activated.
11	*
12	* @since 1.9.7.4
13	*
14	* @param bool $network_wide Is network wide activation.
15	*/
16	function convertkit_plugin_activate( $network_wide ) {
17
18	// Initialise Plugin.
19	$convertkit = WP_ConvertKit();
20	$convertkit->initialize();
21
22	// Check if we are on a multisite install, activating network wide, or a single install.
23	if ( ! is_multisite() \|\| ! $network_wide ) {
24	// Single Site activation.
25	$convertkit->get_class( 'setup' )->activate();
26
27	// Set a transient for 30 seconds to redirect to the setup screen on activation.
28	set_transient( 'convertkit-setup', true, 30 );
29	} else {
30	// Multisite network wide activation.
31	$sites = get_sites(
32	array(
33	'number' => 0,
34	)
35	);
36	foreach ( $sites as $site ) {
37	switch_to_blog( (int) $site->blog_id );
38	$convertkit->get_class( 'setup' )->activate();
39	restore_current_blog();
40	}
41	}
42
43	}
44
45	/**
46	* Runs the activation and update routines when the plugin is activated
47	* on a WordPress multisite setup.
48	*
49	* @since 1.9.7.4
50	*
51	* @param WP_Site\|int $site_or_blog_id WP_Site or Blog ID.
52	*/
53	function convertkit_plugin_activate_new_site( $site_or_blog_id ) {
54
55	// Check if $site_or_blog_id is a WP_Site or a blog ID.
56	if ( is_a( $site_or_blog_id, 'WP_Site' ) ) {
57	$site_or_blog_id = $site_or_blog_id->blog_id;
58	}
59
60	// Initialise Plugin.
61	$convertkit = WP_ConvertKit();
62	$convertkit->initialize();
63
64	// Run installation routine.
65	switch_to_blog( $site_or_blog_id );
66	$convertkit->get_class( 'setup' )->activate();
67	restore_current_blog();
68
69	}
70
71	/**
72	* Runs the deactivation routine when the plugin is deactivated.
73	*
74	* @since 1.9.7.4
75	*
76	* @param bool $network_wide Is network wide deactivation.
77	*/
78	function convertkit_plugin_deactivate( $network_wide ) {
79
80	// Initialise Plugin.
81	$convertkit = WP_ConvertKit();
82	$convertkit->initialize();
83
84	// Check if we are on a multisite install, activating network wide, or a single install.
85	if ( ! is_multisite() \|\| ! $network_wide ) {
86	// Single Site activation.
87	$convertkit->get_class( 'setup' )->deactivate();
88	} else {
89	// Multisite network wide activation.
90	$sites = get_sites(
91	array(
92	'number' => 0,
93	)
94	);
95	foreach ( $sites as $site ) {
96	switch_to_blog( (int) $site->blog_id );
97	$convertkit->get_class( 'setup' )->deactivate();
98	restore_current_blog();
99	}
100	}
101
102	}
103
104	/**
105	* Helper method to get supported Post Types.
106	*
107	* @since 1.9.6
108	*
109	* @return array Post Types
110	*/
111	function convertkit_get_supported_post_types() {
112
113	// Define supported Post Types.
114	$post_types = array(
115	'page',
116	'post',
117	);
118
119	// If public Custom Post Types can be fetched, include them now.
120	if ( function_exists( 'get_post_types' ) ) {
121	// Get public Custom Post Types.
122	$custom_post_types = (array) get_post_types(
123	array(
124	'public' => true,
125
126	// Don't include WordPress' built in Post Types, such as attachment, revisino and nav_menu_item.
127	'_builtin' => false,
128	)
129	);
130
131	$post_types = array_merge(
132	$post_types,
133	array_keys( $custom_post_types )
134	);
135	}
136
137	/**
138	* Defines the Post Types that support ConvertKit Forms.
139	*
140	* @since 1.9.6
141	*
142	* @param array $post_types Post Types
143	*/
144	$post_types = apply_filters( 'convertkit_get_supported_post_types', $post_types );
145
146	return $post_types;
147
148	}
149
150	/**
151	* Determines whether the current user can create and publish the given Post Type.
152	*
153	* @since 3.3.9
154	*
155	* @param string $post_type Post Type.
156	* @return bool User can create and publish Post Type.
157	*/
158	function convertkit_user_can_create_published_post_type( $post_type ) {
159
160	$post_type_object = get_post_type_object( $post_type );
161
162	if ( ! $post_type_object ) {
163	return false;
164	}
165
166	return current_user_can( $post_type_object->cap->create_posts ) && current_user_can( $post_type_object->cap->publish_posts );
167
168	}
169
170	/**
171	* Helper method to get supported Post Types for Restricted Content (Member's Content)
172	*
173	* @since 2.1.0
174	*
175	* @deprecated 2.4.3 No longer used by internal code and not recommended. Use `convertkit_get_supported_post_types` instead.
176	*
177	* @return array Post Types
178	*/
179	function convertkit_get_supported_restrict_content_post_types() {
180
181	return convertkit_get_supported_post_types();
182
183	}
184
185	/**
186	* Helper method to get registered Shortcodes.
187	*
188	* @since 1.9.6.5
189	*
190	* @return array Shortcodes
191	*/
192	function convertkit_get_shortcodes() {
193
194	$shortcodes = array();
195
196	/**
197	* Registers shortcodes for the ConvertKit Plugin.
198	*
199	* @since 1.9.6.5
200	*
201	* @param array $shortcodes Shortcodes
202	*/
203	$shortcodes = apply_filters( 'convertkit_shortcodes', $shortcodes );
204
205	return $shortcodes;
206
207	}
208
209	/**
210	* Helper method to get registered Blocks.
211	*
212	* @since 1.9.6
213	*
214	* @return array Blocks
215	*/
216	function convertkit_get_blocks() {
217
218	$blocks = array();
219
220	/**
221	* Registers blocks for the ConvertKit Plugin.
222	*
223	* @since 1.9.6
224	*
225	* @param array $blocks Blocks
226	*/
227	$blocks = apply_filters( 'convertkit_blocks', $blocks );
228
229	return $blocks;
230
231	}
232
233	/**
234	* Helper method to get registered Block formatters for Gutenberg.
235	*
236	* @since 2.2.0
237	*
238	* @return array Block formatters
239	*/
240	function convertkit_get_block_formatters() {
241
242	$block_formatters = array();
243
244	/**
245	* Registers block formatters in Gutenberg for the ConvertKit Plugin.
246	*
247	* @since 2.2.0
248	*
249	* @param array $block_formatters Block formatters.
250	*/
251	$block_formatters = apply_filters( 'convertkit_get_block_formatters', $block_formatters );
252
253	return $block_formatters;
254
255	}
256
257	/**
258	* Helper method to get registered plugin sidebars.
259	*
260	* @since 3.3.0
261	*
262	* @return array Plugin sidebars
263	*/
264	function convertkit_get_plugin_sidebars() {
265
266	$plugin_sidebars = array();
267
268	/**
269	* Registers plugin sidebars for the WordPress block editor.
270	*
271	* @since 3.3.0
272	*
273	* @param array $plugin_sidebars Plugin sidebars.
274	*/
275	$plugin_sidebars = apply_filters( 'convertkit_plugin_sidebars', $plugin_sidebars );
276
277	return $plugin_sidebars;
278
279	}
280
281	/**
282	* Helper method to get registered pre-publish actions.
283	*
284	* @since 2.4.0
285	*
286	* @return array Pre-publish actions
287	*/
288	function convertkit_get_pre_publish_actions() {
289
290	$pre_publish_actions = array();
291
292	/**
293	* Registers pre-publish actions for the ConvertKit Plugin.
294	*
295	* @since 2.4.0
296	*
297	* @param array $pre_publish_panels Pre-publish actions.
298	*/
299	$pre_publish_actions = apply_filters( 'convertkit_get_pre_publish_actions', $pre_publish_actions );
300
301	return $pre_publish_actions;
302
303	}
304
305	/**
306	* Helper method to get registered importers that can replace third party
307	* form shortcodes and blocks with Kit form shortcodes and blocks.
308	*
309	* @since 3.1.7
310	*
311	* @return array Importers.
312	*/
313	function convertkit_get_form_importers() {
314
315	$importers = array();
316
317	/**
318	* Registers form importers for the ConvertKit Plugin.
319	*
320	* @since 3.1.7
321	*
322	* @param array $importers Importers.
323	*/
324	$importers = apply_filters( 'convertkit_get_form_importers', $importers );
325
326	return $importers;
327
328	}
329
330	/**
331	* Helper method to return the Plugin Settings Link
332	*
333	* @since 1.9.6
334	*
335	* @param array $query_args Optional Query Args.
336	* @return string Settings Link
337	*/
338	function convertkit_get_settings_link( $query_args = array() ) {
339
340	$query_args = array_merge(
341	$query_args,
342	array(
343	'page' => '_wp_convertkit_settings',
344	)
345	);
346
347	return add_query_arg( $query_args, admin_url( 'options-general.php' ) );
348
349	}
350
351	/**
352	* Helper method to return the Plugin Settings Link
353	*
354	* @since 2.2.4
355	*
356	* @param array $query_args Optional Query Args.
357	* @return string Settings Link
358	*/
359	function convertkit_get_setup_wizard_plugin_link( $query_args = array() ) {
360
361	$query_args = array_merge(
362	$query_args,
363	array(
364	'page' => 'convertkit-setup',
365	)
366	);
367
368	return add_query_arg( $query_args, admin_url( 'options.php' ) );
369
370	}
371
372	/**
373	* Helper method to return the URL the user needs to visit to register a ConvertKit account.
374	*
375	* @since 1.9.8.4
376	*
377	* @return string ConvertKit Registration URL.
378	*/
379	function convertkit_get_registration_url() {
380
381	return add_query_arg(
382	array(
383	'utm_source' => 'wordpress',
384	'utm_term' => get_locale(),
385	'utm_content' => 'convertkit',
386	),
387	'https://app.kit.com/users/signup'
388	);
389
390	}
391
392	/**
393	* Helper method to return the URL the user needs to visit to sign in to their ConvertKit account.
394	*
395	* @since 1.9.6.1
396	*
397	* @return string ConvertKit Login URL.
398	*/
399	function convertkit_get_sign_in_url() {
400
401	return add_query_arg(
402	array(
403	'utm_source' => 'wordpress',
404	'utm_term' => get_locale(),
405	'utm_content' => 'convertkit',
406	),
407	'https://app.kit.com/'
408	);
409
410	}
411
412	/**
413	* Helper method to return the URL the user needs to visit to manage thier billing.
414	*
415	* @since 2.2.7
416	*
417	* @return string ConvertKit Billing URL.
418	*/
419	function convertkit_get_billing_url() {
420
421	return add_query_arg(
422	array(
423	'utm_source' => 'wordpress',
424	'utm_term' => get_locale(),
425	'utm_content' => 'convertkit',
426	),
427	'https://app.kit.com/account_settings/billing/'
428	);
429
430	}
431
432	/**
433	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Form or Landing Page.
434	*
435	* @since 2.2.3
436	*
437	* @return string ConvertKit App URL
438	*/
439	function convertkit_get_new_form_url() {
440
441	return add_query_arg(
442	array(
443	'utm_source' => 'wordpress',
444	'utm_term' => get_locale(),
445	'utm_content' => 'convertkit',
446	),
447	'https://app.kit.com/forms/new/'
448	);
449
450	}
451
452	/**
453	* Helper method to return the URL the user needs to visit to edit ConvertKit forms.
454	*
455	* @since 2.2.3
456	*
457	* @return string ConvertKit Form Editor URL.
458	*/
459	function convertkit_get_form_editor_url() {
460
461	return add_query_arg(
462	array(
463	'utm_source' => 'wordpress',
464	'utm_term' => get_locale(),
465	'utm_content' => 'convertkit',
466	),
467	'https://app.kit.com/forms'
468	);
469
470	}
471
472	/**
473	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Landing Page.
474	*
475	* @since 2.5.5
476	*
477	* @return string ConvertKit App URL
478	*/
479	function convertkit_get_new_landing_page_url() {
480
481	return add_query_arg(
482	array(
483	'utm_source' => 'wordpress',
484	'utm_term' => get_locale(),
485	'utm_content' => 'convertkit',
486	),
487	'https://app.kit.com/pages/new/'
488	);
489
490	}
491
492	/**
493	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Tag.
494	*
495	* @since 2.3.3
496	*
497	* @return string ConvertKit App URL.
498	*/
499	function convertkit_get_new_tag_url() {
500
501	return add_query_arg(
502	array(
503	'utm_source' => 'wordpress',
504	'utm_term' => get_locale(),
505	'utm_content' => 'convertkit',
506	),
507	'https://app.kit.com/subscribers/'
508	);
509
510	}
511
512	/**
513	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Broadcast.
514	*
515	* @since 2.2.6
516	*
517	* @return string ConvertKit App URL.
518	*/
519	function convertkit_get_new_broadcast_url() {
520
521	return add_query_arg(
522	array(
523	'utm_source' => 'wordpress',
524	'utm_term' => get_locale(),
525	'utm_content' => 'convertkit',
526	),
527	'https://app.kit.com/campaigns/'
528	);
529
530	}
531
532	/**
533	* Helper method to return the URL the user needs to visit on the ConvertKit app to edit a draft Broadcast.
534	*
535	* @since 2.4.0
536	*
537	* @param int $broadcast_id ConvertKit Broadcast ID.
538	* @return string ConvertKit App URL.
539	*/
540	function convertkit_get_edit_broadcast_url( $broadcast_id ) {
541
542	return add_query_arg(
543	array(
544	'utm_source' => 'wordpress',
545	'utm_term' => get_locale(),
546	'utm_content' => 'convertkit',
547	),
548	sprintf(
549	'https://app.kit.com/campaigns/%s/draft',
550	$broadcast_id
551	)
552	);
553
554	}
555
556	/**
557	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Product.
558	*
559	* @since 2.2.3
560	*
561	* @return string ConvertKit App URL.
562	*/
563	function convertkit_get_new_product_url() {
564
565	return add_query_arg(
566	array(
567	'utm_source' => 'wordpress',
568	'utm_term' => get_locale(),
569	'utm_content' => 'convertkit',
570	),
571	'https://app.kit.com/products/new/'
572	);
573
574	}
575
576	/**
577	* Helper method to enqueue the frontend CSS file.
578	*
579	* @since 3.2.0
580	*/
581	function convertkit_enqueue_frontend_css() {
582
583	wp_enqueue_style( 'convertkit-frontend', CONVERTKIT_PLUGIN_URL . 'resources/frontend/css/frontend.css', array(), CONVERTKIT_PLUGIN_VERSION );
584
585	}
586
587	/**
588	* Helper method to enqueue the frontend JS file.
589	*
590	* @since 3.2.0
591	*/
592	function convertkit_enqueue_frontend_js() {
593
594	wp_enqueue_script(
595	'convertkit-js',
596	CONVERTKIT_PLUGIN_URL . 'resources/frontend/js/dist/frontend.min.js',
597	array(),
598	CONVERTKIT_PLUGIN_VERSION,
599	true
600	);
601
602	}
603
604	/**
605	* Helper method to enqueue Select2 scripts for use within the ConvertKit Plugin.
606	*
607	* @since 1.9.6.4
608	*/
609	function convertkit_select2_enqueue_scripts() {
610
611	wp_enqueue_script( 'convertkit-select2', 'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js', array( 'jquery' ), CONVERTKIT_PLUGIN_VERSION, false );
612	wp_enqueue_script( 'convertkit-admin-select2', CONVERTKIT_PLUGIN_URL . 'resources/backend/js/select2.js', array( 'convertkit-select2' ), CONVERTKIT_PLUGIN_VERSION, false );
613
614	}
615
616	/**
617	* Helper method to enqueue Select2 stylesheets for use within the ConvertKit Plugin.
618	*
619	* @since 1.9.6.4
620	*/
621	function convertkit_select2_enqueue_styles() {
622
623	wp_enqueue_style( 'convertkit-select2', 'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css', array(), CONVERTKIT_PLUGIN_VERSION );
624	wp_enqueue_style( 'convertkit-admin-select2', CONVERTKIT_PLUGIN_URL . 'resources/backend/css/select2.css', array(), CONVERTKIT_PLUGIN_VERSION );
625
626	}
627
628	/**
629	* Return the contents of the given local file.
630	*
631	* @since 2.2.2
632	*
633	* @param string $local_file Local file, including path.
634	* @return string File contents.
635	*/
636	function convertkit_get_file_contents( $local_file ) {
637
638	// Bail if the file doesn't exist.
639	if ( ! file_exists( $local_file ) ) {
640	return '';
641	}
642
643	// Read file.
644	$contents = file_get_contents( $local_file ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
645
646	// Return an empty string if the contents of the file could not be read.
647	if ( ! $contents ) {
648	return '';
649	}
650
651	// Return file's contents.
652	return $contents;
653
654	}
655
656	/**
657	* Returns a dropdown field commonly used for settings, comprising of:
658	* - Do not subscribe
659	* - Subscribe
660	* - Subscribe to Form
661	*
662	* @since 2.5.2
663	*
664	* @param string $name Field name.
665	* @param string $value Field value.
666	* @param string $id Field ID attribute.
667	* @param string $css_class Field CSS class(es).
668	* @param string $context Resource context.
669	* @param bool\|array $additional_options Additional <option> key/value pairs.
670	*/
671	function convertkit_get_subscription_dropdown_field( $name, $value, $id, $css_class = '', $context = '', $additional_options = false ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter
672
673	// Load resource classes.
674	$forms = new ConvertKit_Resource_Forms( $context );
675	$tags = new ConvertKit_Resource_Tags( $context );
676	$sequences = new ConvertKit_Resource_Sequences( $context );
677
678	ob_start();
679	include CONVERTKIT_PLUGIN_PATH . '/views/backend/subscription-dropdown-field.php';
680	$output = trim( ob_get_clean() );
681
682	// Return output.
683	return $output;
684
685	}
686
687	/**
688	* Helper method to safely call get_current_screen(), returning false
689	* if the function is not available or returns null.
690	*
691	* Otherwise returns the given WP_Screen property.
692	*
693	* @since 2.5.9
694	*
695	* @param string $property WP_Screen property to return.
696	* @return bool\|string
697	*/
698	function convertkit_get_current_screen( $property ) {
699
700	// Bail if we cannot determine the screen.
701	if ( ! function_exists( 'get_current_screen' ) ) {
702	return false;
703	}
704
705	// Get screen.
706	$screen = get_current_screen();
707
708	// Bail if the screen couldn't be determined.
709	if ( is_null( $screen ) ) {
710	return false;
711	}
712
713	// Return property.
714	return $screen->$property;
715
716	}
717
718	/**
719	* Outputs the Intercom help widget script.
720	*
721	* @since 2.7.2
722	*/
723	function convertkit_output_intercom_messenger() {
724
725	?>
726	<script>
727	const KIT_INTERCOM_APP_ID = 'e4n3xtxz';
728	window.intercomSettings = {
729	api_base: 'https://api-iam.intercom.io',
730	app_id: KIT_INTERCOM_APP_ID
731	};
732	</script>
733
734	<script>
735	(function(){var w=window;var ic=w.Intercom;if(typeof ic==="function"){ic('update',w.intercomSettings);}else{var d=document;var i=function(){i.c(arguments);};i.q=[];i.c=function(args){i.q.push(args);};w.Intercom=i;var l=function(){var s=d.createElement('script');s.type='text/javascript';s.async=true;s.src='https://widget.intercom.io/widget/' + KIT_INTERCOM_APP_ID;var x=d.getElementsByTagName('script')[0];x.parentNode.insertBefore(s, x);};if(document.readyState==='complete'){l();}else if(w.attachEvent){w.attachEvent('onload',l);}else{w.addEventListener('load',l,false);}}})();
736	</script>
737	<?php
738
739	}
740
741	/**
742	* Checks if the given Theme is active.
743	*
744	* @since 3.1.4
745	*
746	* @param string $theme_name Theme name.
747	* @return bool
748	*/
749	function convertkit_is_theme_active( $theme_name ) {
750
751	// Assume Theme isn't active if we can't detect it.
752	if ( ! function_exists( 'wp_get_theme' ) ) {
753	return false;
754	}
755
756	// Check the Parent Theme if we're on a Child Theme.
757	if ( wp_get_theme()->parent() ) {
758	$theme = wp_get_theme()->parent();
759	} else {
760	$theme = wp_get_theme();
761	}
762
763	return strtolower( $theme->get( 'Name' ) ) === strtolower( $theme_name );
764
765	}
766
767	/**
768	* Returns permitted HTML output when using wp_kses( ..., convertkit_kses_allowed_html()).
769	*
770	* @since 2.8.5
771	*/
772	function convertkit_kses_allowed_html() {
773
774	// Get WordPress' permitted HTML elements.
775	$elements = wp_kses_allowed_html( 'post' );
776
777	// Add form elements.
778	$form_elements = array(
779	'input' => array(
780	'type' => true,
781	'id' => true,
782	'name' => true,
783	'class' => true,
784	'value' => true,
785	'checked' => true,
786	'min' => true,
787	'max' => true,
788	'step' => true,
789	'data-*' => true,
790	),
791	'select' => array(
792	'id' => true,
793	'name' => true,
794	'class' => true,
795	'size' => true,
796	'multiple' => true,
797	'data-*' => true,
798	),
799	'option' => array(
800	'value' => true,
801	'selected' => true,
802	'data-*' => true,
803	),
804	'optgroup' => array(
805	'label' => true,
806	'data-*' => true,
807	),
808	'label' => array(
809	'for' => true,
810	),
811	);
812
813	return array_merge( $elements, $form_elements );
814
815	}
816
817	/**
818	* Saves the new access token, refresh token and its expiry, and schedules
819	* a WordPress Cron event to refresh the token on expiry.
820	*
821	* @since 3.1.1
822	*
823	* @param array $result New Access Token, Refresh Token and Expiry.
824	* @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
825	*/
826	function convertkit_maybe_update_credentials( $result, $client_id ) {
827
828	// Don't save these credentials if they're not for this Client ID.
829	// They're for another Kit Plugin that uses OAuth.
830	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
831	return;
832	}
833
834	$settings = new ConvertKit_Settings();
835	$settings->update_credentials( $result );
836
837	}
838
839	/**
840	* Deletes the stored access token, refresh token and its expiry from the Plugin settings,
841	* and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
842	* when the user revokes the access token.
843	*
844	* @since 3.2.4
845	*
846	* @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
847	*/
848	function convertkit_delete_credentials( $client_id ) {
849
850	// Don't delete these credentials if they're not for this Client ID.
851	// They're for another Kit Plugin that uses OAuth.
852	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
853	return;
854	}
855
856	// Delete Access and Refresh Tokens.
857	$settings = new ConvertKit_Settings();
858	$settings->delete_credentials();
859
860	}
861
862	/**
863	* Deletes the stored access token, refresh token and its expiry from the Plugin settings,
864	* and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
865	* when either:
866	* - The access token is invalid
867	* - The access token expired, and refreshing failed
868	*
869	* @since 3.1.1
870	*
871	* @param WP_Error $result Error result.
872	* @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
873	*/
874	function convertkit_maybe_delete_credentials( $result, $client_id ) {
875
876	// Don't save these credentials if they're not for this Client ID.
877	// They're for another Kit Plugin that uses OAuth.
878	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
879	return;
880	}
881
882	// If the error isn't a 401, don't delete credentials.
883	// This could be e.g. a temporary network error, rate limit or similar.
884	if ( $result->get_error_data( 'convertkit_api_error' ) !== 401 ) {
885	return;
886	}
887
888	// Persist an error notice in the WordPress Administration until the user fixes the problem.
889	WP_ConvertKit()->get_class( 'admin_notices' )->add( 'authorization_failed' );
890
891	$settings = new ConvertKit_Settings();
892	$settings->delete_credentials();
893
894	}
895
896	// Update Access Token when refreshed by the API class.
897	add_action( 'convertkit_api_get_access_token', 'convertkit_maybe_update_credentials', 10, 2 );
898	add_action( 'convertkit_api_refresh_token', 'convertkit_maybe_update_credentials', 10, 2 );
899
900	// Delete credentials when the user revokes the access and refresh tokens.
901	add_action( 'convertkit_api_revoke_tokens', 'convertkit_delete_credentials', 10, 1 );
902
903	// Delete credentials if the API class uses a invalid access token.
904	// This prevents the Plugin making repetitive API requests that will 401.
905	add_action( 'convertkit_api_access_token_invalid', 'convertkit_maybe_delete_credentials', 10, 2 );
906