Takayuki Miyoshi

Double Opt-In Helper is a WordPress plugin that helps developers implement the double opt-in process in their plugins.
<h4>What is double opt-in?</h4>
Double opt-in is a procedure used to confirm user’s consent. Today, service providers are required to obtain clear consent from users prior to collecting or using their personal data. In some situations, however, asking the user to tick an “I agree.” checkbox is not sufficient. Double opt-in serves a useful role in such situations.
A typical double opt-in process starts by the service provider sending an email message to the user. The message includes a URL link to the provider’s website and asks the user to click the link if they agree on conditions. Usually, the URL includes some sort of unique random code that works as a token to confirm the user’s consent.
By doing this, the service provider can confirm that the real user (not a bot or someone else) has consented, because only the user should be able to access messages to their email address.
<h4>I’m a developer. How can I use this plugin?</h4>
First, register an “agent” who can handle double opt-in sessions for you, and knows what to do when a user opts-in.
To register an agent, use the <code>doihelper_register_agent()</code> function. <code>doihelper_register_agent()</code> takes two parameters: the name of the agent (required), and an optional associative array of arguments. The available arguments are:
<ul>
<li><code>acceptance_period</code> — The length of time (in seconds) for how long a double opt-in session remains live. Default value: 86400 (24 hours)</li>
<li><code>optin_callback</code> — The callback function that will be called when a user opts-in.</li>
<li><code>email_callback</code> — The callback function that will be called to send a confirmation email.</li>
</ul>
After registering an agent, start a double opt-in session by calling the <code>doihelper_start_session()</code> function. <code>doihelper_start_session()</code> takes two parameters: the name of the agent (required), and an optional associative array of arguments. The available arguments are:
<ul>
<li><code>email_to</code> — The recipient’s email address, used for the confirmation email. If you omit this argument, no email will be sent. If you do not provide this argument, you will need to provide the user with the confirmation link another way.</li>
<li><code>properties</code> — The properties array of the session. This array is to be passed to the <code>optin_callback</code> function as its only parameter. While you can include any information into this, the primary purpose of it is to pass user-related data to the opt-in callback.</li>
</ul>
The session data will be stored in the database until the user opts-in, or the acceptance period (from <code>doihelper_register_agent()</code>) expires.

Double Opt-In Helper

Double Opt-In Helper is a WordPress plugin that helps developers implement the double opt-in process in their plugins.

Convertful Team

<h3>The All-In-One Tool to Turn Your Visitors Into Leads and Sales</h3>
<a href="https://convertful.com/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">Convertful</a> is the web service that provides you with all the modern on-site conversion solutions, natively integrates with all major Email Marketing Platforms and provides the simplest WordPress installation.
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Start with the FREE plan, that already includes:
<ul>
<li>All the 5 Modern Widget Types: Exit Intent Popups, Floating Bars, Inline Widgets, Scroll Boxes, and Welcome Mats</li>
<li>Exit Intent + 9 Other Smart Display Rules</li>
<li>71 Free Starting Templates</li>
<li>Flexible Drag-n-Drop Editor</li>
<li>27 Native + 1500 Zapier Integrations</li>
<li>Mobile-Friendly Widgets</li>
<li>Live Analytics</li>
<li>Illustrated Manuals and Video-Guides</li>
</ul>
<blockquote>
PLEASE NOTE: 
 This plugin ONLY works as an integration interface to our full-featured <a href="https://convertful.com/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">Convertful</a> web service. A Convertful account is needed to activate the plugin (you can create one through the plugin interface or <a href="https://app.convertful.com/sign_up/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">click here to create your account</a>).
</blockquote>
<h3>Provides all the Modern On-Site Conversion Solutions 👇</h3>
<ol>
<li>Spin-to-Win Gamification — Increase your Email Subscribers and Sales Conversion Rate by offering your visitors to win a coupon code in exchange for the email address.</li>
<li>Scratch Card Gamification — Increase Email Subscribers, Sales Conversion Rate, and Percentage or Returning Customers, by providing the unique gamification experience, which your competitors aren’t using yet.</li>
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<li>Welcome Video Pop-ups — Retarget up to 7.1% of new visitors to the sign-up page and Increase Sign-ups by the welcome popup that shows your Hero Video and offers a quick yes/no choice.</li>
<li>Cart Abandonment Pop-ups — Reduce Shopping Cart Abandonment Rate and increase Sales Conversion Rate by offering a discount right before a visitor leaves your cart or checkout pages. It generally recovers ~21% of leaving buyers.</li>
<li>Welcome Discounts — Increase Sales Conversion Rate and Email Subscribers by offering a welcome discount in exchange for an email subscription to first-time visitors. Complementary countdown timer can show an evergreen deadline to boost conversions.</li>
<li>Follow Coupon Boxes — Reduce Abandonment Rate and increase Social Followers by offering a welcome discount to new visitors in exchange for their social follows just before they leave.</li>
<li>Welcome Giveaway Contests — Increase Email Subscribers by offering a chance to win a valuable giveaway for opting-in. Or increase Website Traffic asking to share your store URL.</li>
<li>Deadline Funnels — Generate Leads and boost Sales Conversion Rate by creating an urgency via live countdown timers. You can add countdown timers to any of your widgets and you can create a personal evergreen deadline for every visitor.</li>
<li>Yes/No Welcome Mats — Convert ~4.5% of new visitors into Email Subscribers by making your best offer with a huge noticeable welcome screen.</li>
<li>Targeted Content Upgrades — Convert ~3.2% of article readers into Email Subscribers by offering a highly-relevant additional content in exchange for the opt-in.</li>
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<li>Content Lockings — Convert up to 17.6% of your visitors into Email Subscribers and Leads by requiring your visitors to opt-in in order to view your premium content.</li>
<li>Social Subscription Pop-ups — Increase Email Subscribers and generate more Leads by placing a complementary ‘Subscribe with Facebook’ button. Once a visitor clicks this button, Convertful grabs his/her name and email address and sends straight to your email list. This allows to reduce friction and avoid email typos.</li>
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</ol>
… and so much more!
<h3>Integrates With What You Already Use</h3>
You can build email list or generate leads to: ActiveCampaign, ActiveTrail, AWeber, Campaign Monitor, ConstantContact, ConvertFox, ConvertKit, Customer.io, FreshMail, GetResponse, HubSpot, Klaviyo, Mad Mimi, MailChimp, MailerLite, MailUp, Remarkety, sendinblue, SendPulse, Sendy, Zapier, and other email marketing services.
<h3>Advanced Targeting Rules</h3>
You can show targeted offers based on: Time on Site, Current Page URL, URL Get Parameter, Landing Page URL, Referrer Type / URL, Number of Viewed Pages, Visit Number, Time from the First Visit, Time from the Last Visit, Cookie Value, Screen Width, Platform, Country / Region / City (Geo Targeting), WordPress Tags and Categories
<h3>EVER-GROWING ARSENAL OF FEATURES AND TOOLS</h3>
We created an opt-in form app that cures the main pain points you might have, fast:
<ul>
<li>Drag-n-drop Widget Editor — We offer a flexible form creator allowing to customize any form element you like: layout, content, colors, positioning, and many more.</li>
<li>Design and templates variety — Design quality and diversity are one of our key principles. Use unique in-lines, pop-ups, sideboxes (slideins), fullscreens and floating bars. Use our library of 50+ modern form templates to create the form that suits your site design the best.</li>
<li>Right audience, right time, right place — Flexibly set your forms’ behavior: when and where to show, and when NOT to show them. Convertful forms will never annoy your visitors.</li>
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<li>Responsive forms — All opt-in forms are mobile-friendly. Period. Your visitors will never fall enraged by inconvenient mobile experience.</li>
<li>A/B-testing — Test your lead magnets, understand your audience’s preferences and become ultimately convertful.</li>
<li>Easy stats without Google Analytics — We offer an easy way to view your funnel results without connecting to Google Analytics: see which form brought you subscribers, what was it conversion, how many visitors and impressions there were.</li>
</ul>
<h3>Get Support and Know-How</h3>
Visit our open and friendly-written <a href="https://app.convertful.com/docs/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">Knowledge Base (Documentation)</a>. Get easy step-by-step visual instructions, video tutorials and know-hows.
Contact us on the <a href="https://convertful.com/contact-form/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">contact form</a> with your questions, or get your technical issues and feature requests done on our <a href="https://app.convertful.com/tickets/?utm_source=integration&utm_medium=wordpress&utm_campaign=wordpress-plugin" rel="nofollow ugc">support portal</a> .
We would be happy to see you on the <a href="https://convertful.com/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">Convertful website</a>.
<blockquote>
PLEASE NOTE: 
 This plugin ONLY works as an integration interface to our full-featured <a href="https://convertful.com/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">Convertful</a> web service. A Convertful account is needed to activate the plugin (you can create one through the plugin interface or <a href="https://app.convertful.com/sign_up/?utm_medium=plugins&utm_source=wordpress-plugin" rel="nofollow ugc">click here to create your account).</a>
</blockquote>

Convertful – Your Ultimate On-Site Conversion Tool

All the modern on-site conversion solutions, natively integrates with all modern Email Marketing Platforms.

Double Opt-In Helper vs Convertful – Your Ultimate On-Site Conversion Tool