← All changes | includes/functions.php +541 -43 2.2.7 → trunk View file →

		@@ -16,8 +16,9 @@
16	16	function convertkit_plugin_activate( $network_wide ) {
17	17
18	18	// Initialise Plugin.
19	19	$convertkit = WP_ConvertKit();
	20	+ $convertkit->initialize();
20	21
21	22	// Check if we are on a multisite install, activating network wide, or a single install.
22	23	if ( ! is_multisite() || ! $network_wide ) {
23	24	// Single Site activation.
		@@ -57,8 +58,9 @@
57	58	}
58	59
59	60	// Initialise Plugin.
60	61	$convertkit = WP_ConvertKit();
	62	+ $convertkit->initialize();
61	63
62	64	// Run installation routine.
63	65	switch_to_blog( $site_or_blog_id );
64	66	$convertkit->get_class( 'setup' )->activate();
		@@ -76,8 +78,9 @@
76	78	function convertkit_plugin_deactivate( $network_wide ) {
77	79
78	80	// Initialise Plugin.
79	81	$convertkit = WP_ConvertKit();
	82	+ $convertkit->initialize();
80	83
81	84	// Check if we are on a multisite install, activating network wide, or a single install.
82	85	if ( ! is_multisite() || ! $network_wide ) {
83	86	// Single Site activation.
		@@ -106,13 +109,32 @@
106	109	* @return array Post Types
107	110	*/
108	111	function convertkit_get_supported_post_types() {
109	112
	113	+ // Define supported Post Types.
110	114	$post_types = array(
111	115	'page',
112	116	'post',
113	117	);
114	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	+
115	137	/**
116	138	* Defines the Post Types that support ConvertKit Forms.
117	139	*
118	140	* @since 1.9.6
		@@ -125,31 +147,40 @@
125	147
126	148	}
127	149
128	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	+/**
129	171	* Helper method to get supported Post Types for Restricted Content (Member's Content)
130	172	*
131	173	* @since 2.1.0
132	174	*
	175	+ * @deprecated 2.4.3 No longer used by internal code and not recommended. Use `convertkit_get_supported_post_types` instead.
	176	+ *
133	177	* @return array Post Types
134	178	*/
135	179	function convertkit_get_supported_restrict_content_post_types() {
136	180
137		- $post_types = array(
138		- 'page',
139		- );
	181	+ return convertkit_get_supported_post_types();
140	182
141		- /**
142		- * Defines the Post Types that support Restricted Content / Members Content functionality.
143		- *
144		- * @since 2.0.0
145		- *
146		- * @param array $post_types Post Types
147		- */
148		- $post_types = apply_filters( 'convertkit_get_supported_restrict_content_post_types', $post_types );
149		-
150		- return $post_types;
151		-
152	183	}
153	184
154	185	/**
155	186	* Helper method to get registered Shortcodes.
		@@ -223,8 +254,153 @@
223	254
224	255	}
225	256
226	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 get registered abilities.
	332	+ *
	333	+ * @since 3.4.0
	334	+ *
	335	+ * @return array Abilities.
	336	+ */
	337	+function convertkit_get_abilities() {
	338	+
	339	+ $abilities = array();
	340	+
	341	+ /**
	342	+ * Registers abilities for the Kit Plugin.
	343	+ *
	344	+ * @since 3.4.0
	345	+ *
	346	+ * @param array $abilities Abilities.
	347	+ */
	348	+ $abilities = apply_filters( 'convertkit_abilities', $abilities );
	349	+
	350	+ return $abilities;
	351	+
	352	+}
	353	+
	354	+/**
	355	+ * Helper method to get registered MCP resources.
	356	+ *
	357	+ * @since 3.4.2
	358	+ *
	359	+ * @return array Resources.
	360	+ */
	361	+function convertkit_get_resources() {
	362	+
	363	+ $resources = array();
	364	+
	365	+ /**
	366	+ * Registers MCP resources for the Kit Plugin.
	367	+ *
	368	+ * @since 3.4.2
	369	+ *
	370	+ * @param array $resources Resources.
	371	+ */
	372	+ $resources = apply_filters( 'convertkit_resources', $resources );
	373	+
	374	+ return $resources;
	375	+
	376	+}
	377	+
	378	+/**
	379	+ * Helper method to get registered MCP prompts.
	380	+ *
	381	+ * @since 3.4.2
	382	+ *
	383	+ * @return array Prompts.
	384	+ */
	385	+function convertkit_get_prompts() {
	386	+
	387	+ $prompts = array();
	388	+
	389	+ /**
	390	+ * Registers MCP prompts for the Kit Plugin.
	391	+ *
	392	+ * @since 3.4.2
	393	+ *
	394	+ * @param array $prompts Prompts.
	395	+ */
	396	+ $prompts = apply_filters( 'convertkit_prompts', $prompts );
	397	+
	398	+ return $prompts;
	399	+
	400	+}
	401	+
	402	+/**
227	403	* Helper method to return the Plugin Settings Link
228	404	*
229	405	* @since 1.9.6
230	406	*
		@@ -260,9 +436,9 @@
260	436	'page' => 'convertkit-setup',
261	437	)
262	438	);
263	439
264		- return add_query_arg( $query_args, admin_url( 'index.php' ) );
	440	+ return add_query_arg( $query_args, admin_url( 'options.php' ) );
265	441
266	442	}
267	443
268	444	/**
		@@ -279,9 +455,9 @@
279	455	'utm_source' => 'wordpress',
280	456	'utm_term' => get_locale(),
281	457	'utm_content' => 'convertkit',
282	458	),
283		- 'https://app.convertkit.com/users/signup'
	459	+ 'https://app.kit.com/users/signup'
284	460	);
285	461
286	462	}
287	463
		@@ -299,9 +475,9 @@
299	475	'utm_source' => 'wordpress',
300	476	'utm_term' => get_locale(),
301	477	'utm_content' => 'convertkit',
302	478	),
303		- 'https://app.convertkit.com/'
	479	+ 'https://app.kit.com/'
304	480	);
305	481
306	482	}
307	483
		@@ -319,21 +495,21 @@
319	495	'utm_source' => 'wordpress',
320	496	'utm_term' => get_locale(),
321	497	'utm_content' => 'convertkit',
322	498	),
323		- 'https://app.convertkit.com/account_settings/billing/'
	499	+ 'https://app.kit.com/account_settings/billing/'
324	500	);
325	501
326	502	}
327	503
328	504	/**
329		- * Helper method to return the URL the user needs to visit on the ConvertKit app to obtain their API Key and Secret.
	505	+ * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Form or Landing Page.
330	506	*
331		- * @since 1.9.6.1
	507	+ * @since 2.2.3
332	508	*
333		- * @return string ConvertKit App URL.
	509	+ * @return string ConvertKit App URL
334	510	*/
335		-function convertkit_get_api_key_url() {
	511	+function convertkit_get_new_form_url() {
336	512
337	513	return add_query_arg(
338	514	array(
339	515	'utm_source' => 'wordpress',
		@@ -339,21 +515,41 @@
339	515	'utm_source' => 'wordpress',
340	516	'utm_term' => get_locale(),
341	517	'utm_content' => 'convertkit',
342	518	),
343		- 'https://app.convertkit.com/account_settings/advanced_settings/'
	519	+ 'https://app.kit.com/forms/new/'
344	520	);
345	521
346	522	}
347	523
348	524	/**
349		- * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Form or Landing Page.
	525	+ * Helper method to return the URL the user needs to visit to edit ConvertKit forms.
350	526	*
351	527	* @since 2.2.3
352	528	*
	529	+ * @return string ConvertKit Form Editor URL.
	530	+ */
	531	+function convertkit_get_form_editor_url() {
	532	+
	533	+ return add_query_arg(
	534	+ array(
	535	+ 'utm_source' => 'wordpress',
	536	+ 'utm_term' => get_locale(),
	537	+ 'utm_content' => 'convertkit',
	538	+ ),
	539	+ 'https://app.kit.com/forms'
	540	+ );
	541	+
	542	+}
	543	+
	544	+/**
	545	+ * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Landing Page.
	546	+ *
	547	+ * @since 2.5.5
	548	+ *
353	549	* @return string ConvertKit App URL
354	550	*/
355		-function convertkit_get_new_form_url() {
	551	+function convertkit_get_new_landing_page_url() {
356	552
357	553	return add_query_arg(
358	554	array(
359	555	'utm_source' => 'wordpress',
		@@ -359,21 +555,21 @@
359	555	'utm_source' => 'wordpress',
360	556	'utm_term' => get_locale(),
361	557	'utm_content' => 'convertkit',
362	558	),
363		- 'https://app.convertkit.com/forms/new/'
	559	+ 'https://app.kit.com/pages/new/'
364	560	);
365	561
366	562	}
367	563
368	564	/**
369		- * Helper method to return the URL the user needs to visit to edit ConvertKit forms.
	565	+ * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Tag.
370	566	*
371		- * @since 2.2.3
	567	+ * @since 2.3.3
372	568	*
373		- * @return string ConvertKit Form Editor URL.
	569	+ * @return string ConvertKit App URL.
374	570	*/
375		-function convertkit_get_form_editor_url() {
	571	+function convertkit_get_new_tag_url() {
376	572
377	573	return add_query_arg(
378	574	array(
379	575	'utm_source' => 'wordpress',
		@@ -379,9 +575,9 @@
379	575	'utm_source' => 'wordpress',
380	576	'utm_term' => get_locale(),
381	577	'utm_content' => 'convertkit',
382	578	),
383		- 'https://app.convertkit.com/forms'
	579	+ 'https://app.kit.com/subscribers/'
384	580	);
385	581
386	582	}
387	583
		@@ -399,14 +595,38 @@
399	595	'utm_source' => 'wordpress',
400	596	'utm_term' => get_locale(),
401	597	'utm_content' => 'convertkit',
402	598	),
403		- 'https://app.convertkit.com/campaigns/'
	599	+ 'https://app.kit.com/campaigns/'
404	600	);
405	601
406	602	}
407	603
408	604	/**
	605	+ * Helper method to return the URL the user needs to visit on the ConvertKit app to edit a draft Broadcast.
	606	+ *
	607	+ * @since 2.4.0
	608	+ *
	609	+ * @param int $broadcast_id ConvertKit Broadcast ID.
	610	+ * @return string ConvertKit App URL.
	611	+ */
	612	+function convertkit_get_edit_broadcast_url( $broadcast_id ) {
	613	+
	614	+ return add_query_arg(
	615	+ array(
	616	+ 'utm_source' => 'wordpress',
	617	+ 'utm_term' => get_locale(),
	618	+ 'utm_content' => 'convertkit',
	619	+ ),
	620	+ sprintf(
	621	+ 'https://app.kit.com/campaigns/%s/draft',
	622	+ $broadcast_id
	623	+ )
	624	+ );
	625	+
	626	+}
	627	+
	628	+/**
409	629	* Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Product.
410	630	*
411	631	* @since 2.2.3
412	632	*
		@@ -419,14 +639,42 @@
419	639	'utm_source' => 'wordpress',
420	640	'utm_term' => get_locale(),
421	641	'utm_content' => 'convertkit',
422	642	),
423		- 'https://app.convertkit.com/products/new/'
	643	+ 'https://app.kit.com/products/new/'
424	644	);
425	645
426	646	}
427	647
428	648	/**
	649	+ * Helper method to enqueue the frontend CSS file.
	650	+ *
	651	+ * @since 3.2.0
	652	+ */
	653	+function convertkit_enqueue_frontend_css() {
	654	+
	655	+ wp_enqueue_style( 'convertkit-frontend', CONVERTKIT_PLUGIN_URL . 'resources/frontend/css/frontend.css', array(), CONVERTKIT_PLUGIN_VERSION );
	656	+
	657	+}
	658	+
	659	+/**
	660	+ * Helper method to enqueue the frontend JS file.
	661	+ *
	662	+ * @since 3.2.0
	663	+ */
	664	+function convertkit_enqueue_frontend_js() {
	665	+
	666	+ wp_enqueue_script(
	667	+ 'convertkit-js',
	668	+ CONVERTKIT_PLUGIN_URL . 'resources/frontend/js/dist/frontend.min.js',
	669	+ array(),
	670	+ CONVERTKIT_PLUGIN_VERSION,
	671	+ true
	672	+ );
	673	+
	674	+}
	675	+
	676	+/**
429	677	* Helper method to enqueue Select2 scripts for use within the ConvertKit Plugin.
430	678	*
431	679	* @since 1.9.6.4
432	680	*/
		@@ -458,22 +706,272 @@
458	706	* @return string File contents.
459	707	*/
460	708	function convertkit_get_file_contents( $local_file ) {
461	709
462		- // Call globals.
463		- global $wp_filesystem;
	710	+ // Bail if the file doesn't exist.
	711	+ if ( ! file_exists( $local_file ) ) {
	712	+ return '';
	713	+ }
464	714
465		- // Load filesystem class.
466		- require_once ABSPATH . 'wp-admin/includes/file.php';
	715	+ // Read file.
	716	+ $contents = file_get_contents( $local_file ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
467	717
468		- // Initiate.
469		- WP_Filesystem();
470		-
471		- // Bail if the file doesn't exist.
472		- if ( ! $wp_filesystem->exists( $local_file ) ) {
	718	+ // Return an empty string if the contents of the file could not be read.
	719	+ if ( ! $contents ) {
473	720	return '';
474	721	}
475	722
476	723	// Return file's contents.
477		- return $wp_filesystem->get_contents( $local_file );
	724	+ return $contents;
478	725
479	726	}
	727	+
	728	+/**
	729	+ * Returns a dropdown field commonly used for settings, comprising of:
	730	+ * - Do not subscribe
	731	+ * - Subscribe
	732	+ * - Subscribe to Form
	733	+ *
	734	+ * @since 2.5.2
	735	+ *
	736	+ * @param string $name Field name.
	737	+ * @param string $value Field value.
	738	+ * @param string $id Field ID attribute.
	739	+ * @param string $css_class Field CSS class(es).
	740	+ * @param string $context Resource context.
	741	+ * @param bool|array $additional_options Additional <option> key/value pairs.
	742	+ */
	743	+function convertkit_get_subscription_dropdown_field( $name, $value, $id, $css_class = '', $context = '', $additional_options = false ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter
	744	+
	745	+ // Load resource classes.
	746	+ $forms = new ConvertKit_Resource_Forms( $context );
	747	+ $tags = new ConvertKit_Resource_Tags( $context );
	748	+ $sequences = new ConvertKit_Resource_Sequences( $context );
	749	+
	750	+ ob_start();
	751	+ include CONVERTKIT_PLUGIN_PATH . '/views/backend/subscription-dropdown-field.php';
	752	+ $output = trim( ob_get_clean() );
	753	+
	754	+ // Return output.
	755	+ return $output;
	756	+
	757	+}
	758	+
	759	+/**
	760	+ * Helper method to safely call get_current_screen(), returning false
	761	+ * if the function is not available or returns null.
	762	+ *
	763	+ * Otherwise returns the given WP_Screen property.
	764	+ *
	765	+ * @since 2.5.9
	766	+ *
	767	+ * @param string $property WP_Screen property to return.
	768	+ * @return bool|string
	769	+ */
	770	+function convertkit_get_current_screen( $property ) {
	771	+
	772	+ // Bail if we cannot determine the screen.
	773	+ if ( ! function_exists( 'get_current_screen' ) ) {
	774	+ return false;
	775	+ }
	776	+
	777	+ // Get screen.
	778	+ $screen = get_current_screen();
	779	+
	780	+ // Bail if the screen couldn't be determined.
	781	+ if ( is_null( $screen ) ) {
	782	+ return false;
	783	+ }
	784	+
	785	+ // Return property.
	786	+ return $screen->$property;
	787	+
	788	+}
	789	+
	790	+/**
	791	+ * Outputs the Intercom help widget script.
	792	+ *
	793	+ * @since 2.7.2
	794	+ */
	795	+function convertkit_output_intercom_messenger() {
	796	+
	797	+ ?>
	798	+ <script>
	799	+ const KIT_INTERCOM_APP_ID = 'e4n3xtxz';
	800	+ window.intercomSettings = {
	801	+ api_base: 'https://api-iam.intercom.io',
	802	+ app_id: KIT_INTERCOM_APP_ID
	803	+ };
	804	+ </script>
	805	+
	806	+ <script>
	807	+ (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);}}})();
	808	+ </script>
	809	+ <?php
	810	+
	811	+}
	812	+
	813	+/**
	814	+ * Checks if the given Theme is active.
	815	+ *
	816	+ * @since 3.1.4
	817	+ *
	818	+ * @param string $theme_name Theme name.
	819	+ * @return bool
	820	+ */
	821	+function convertkit_is_theme_active( $theme_name ) {
	822	+
	823	+ // Assume Theme isn't active if we can't detect it.
	824	+ if ( ! function_exists( 'wp_get_theme' ) ) {
	825	+ return false;
	826	+ }
	827	+
	828	+ // Check the Parent Theme if we're on a Child Theme.
	829	+ if ( wp_get_theme()->parent() ) {
	830	+ $theme = wp_get_theme()->parent();
	831	+ } else {
	832	+ $theme = wp_get_theme();
	833	+ }
	834	+
	835	+ return strtolower( $theme->get( 'Name' ) ) === strtolower( $theme_name );
	836	+
	837	+}
	838	+
	839	+/**
	840	+ * Returns permitted HTML output when using wp_kses( ..., convertkit_kses_allowed_html()).
	841	+ *
	842	+ * @since 2.8.5
	843	+ */
	844	+function convertkit_kses_allowed_html() {
	845	+
	846	+ // Get WordPress' permitted HTML elements.
	847	+ $elements = wp_kses_allowed_html( 'post' );
	848	+
	849	+ // Add form elements.
	850	+ $form_elements = array(
	851	+ 'input' => array(
	852	+ 'type' => true,
	853	+ 'id' => true,
	854	+ 'name' => true,
	855	+ 'class' => true,
	856	+ 'value' => true,
	857	+ 'checked' => true,
	858	+ 'min' => true,
	859	+ 'max' => true,
	860	+ 'step' => true,
	861	+ 'data-*' => true,
	862	+ ),
	863	+ 'select' => array(
	864	+ 'id' => true,
	865	+ 'name' => true,
	866	+ 'class' => true,
	867	+ 'size' => true,
	868	+ 'multiple' => true,
	869	+ 'data-*' => true,
	870	+ ),
	871	+ 'option' => array(
	872	+ 'value' => true,
	873	+ 'selected' => true,
	874	+ 'data-*' => true,
	875	+ ),
	876	+ 'optgroup' => array(
	877	+ 'label' => true,
	878	+ 'data-*' => true,
	879	+ ),
	880	+ 'label' => array(
	881	+ 'for' => true,
	882	+ ),
	883	+ );
	884	+
	885	+ return array_merge( $elements, $form_elements );
	886	+
	887	+}
	888	+
	889	+/**
	890	+ * Saves the new access token, refresh token and its expiry, and schedules
	891	+ * a WordPress Cron event to refresh the token on expiry.
	892	+ *
	893	+ * @since 3.1.1
	894	+ *
	895	+ * @param array $result New Access Token, Refresh Token and Expiry.
	896	+ * @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
	897	+ */
	898	+function convertkit_maybe_update_credentials( $result, $client_id ) {
	899	+
	900	+ // Don't save these credentials if they're not for this Client ID.
	901	+ // They're for another Kit Plugin that uses OAuth.
	902	+ if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
	903	+ return;
	904	+ }
	905	+
	906	+ $settings = new ConvertKit_Settings();
	907	+ $settings->update_credentials( $result );
	908	+
	909	+}
	910	+
	911	+/**
	912	+ * Deletes the stored access token, refresh token and its expiry from the Plugin settings,
	913	+ * and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
	914	+ * when the user revokes the access token.
	915	+ *
	916	+ * @since 3.2.4
	917	+ *
	918	+ * @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
	919	+ */
	920	+function convertkit_delete_credentials( $client_id ) {
	921	+
	922	+ // Don't delete these credentials if they're not for this Client ID.
	923	+ // They're for another Kit Plugin that uses OAuth.
	924	+ if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
	925	+ return;
	926	+ }
	927	+
	928	+ // Delete Access and Refresh Tokens.
	929	+ $settings = new ConvertKit_Settings();
	930	+ $settings->delete_credentials();
	931	+
	932	+}
	933	+
	934	+/**
	935	+ * Deletes the stored access token, refresh token and its expiry from the Plugin settings,
	936	+ * and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
	937	+ * when either:
	938	+ * - The access token is invalid
	939	+ * - The access token expired, and refreshing failed
	940	+ *
	941	+ * @since 3.1.1
	942	+ *
	943	+ * @param WP_Error $result Error result.
	944	+ * @param string $client_id OAuth Client ID used for the Access and Refresh Tokens.
	945	+ */
	946	+function convertkit_maybe_delete_credentials( $result, $client_id ) {
	947	+
	948	+ // Don't save these credentials if they're not for this Client ID.
	949	+ // They're for another Kit Plugin that uses OAuth.
	950	+ if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
	951	+ return;
	952	+ }
	953	+
	954	+ // If the error isn't a 401, don't delete credentials.
	955	+ // This could be e.g. a temporary network error, rate limit or similar.
	956	+ if ( $result->get_error_data( 'convertkit_api_error' ) !== 401 ) {
	957	+ return;
	958	+ }
	959	+
	960	+ // Persist an error notice in the WordPress Administration until the user fixes the problem.
	961	+ WP_ConvertKit()->get_class( 'admin_notices' )->add( 'authorization_failed' );
	962	+
	963	+ $settings = new ConvertKit_Settings();
	964	+ $settings->delete_credentials();
	965	+
	966	+}
	967	+
	968	+// Update Access Token when refreshed by the API class.
	969	+add_action( 'convertkit_api_get_access_token', 'convertkit_maybe_update_credentials', 10, 2 );
	970	+add_action( 'convertkit_api_refresh_token', 'convertkit_maybe_update_credentials', 10, 2 );
	971	+
	972	+// Delete credentials when the user revokes the access and refresh tokens.
	973	+add_action( 'convertkit_api_revoke_tokens', 'convertkit_delete_credentials', 10, 1 );
	974	+
	975	+// Delete credentials if the API class uses a invalid access token.
	976	+// This prevents the Plugin making repetitive API requests that will 401.
	977	+add_action( 'convertkit_api_access_token_invalid', 'convertkit_maybe_delete_credentials', 10, 2 );