Adrian Tobey

Install this plugin to turn your WP installation into a proxy service to connect your WordPress plugins to Infusionsoft using their Oauth API. 
This plugin was created to create an Oauth connect for FormLift and is now being released for global use for other developers.
This plugin is only for developers who plan on distributing their own plugins among the WordPress community with the need of connecting those plugins via Oauth to Infusionsoft.
Because of the limitations of Oauth, a proxy server is needed to keep your Infusionsoft Developer App’s client_id and client_secret protected as you do not want to place those in your 
plugins files as that could create a massive breach of security, and Infusionsoft might revoke your developer priviledges.
So, follow the setup procedure on <a href="https://oauth.formlift.net" rel="nofollow ugc">This Page</a> to setup your plugin to use this plugin on your proxy site to connect to Infusiosnoft.
To see how to integrate this with your WordPress plugins, visit the plugin homepage at <a href="https://oauth.formlift.net" rel="nofollow ugc">oauth.formlift.net</a>.
<h3>Disclaimers</h3>
By using this plugin in conjuction with your own, you are required to tell your users the following in your reamdme.txt for compliance reasons in all parts of the world:
By using the Ouathentication method for [Your Plugin Here], you consent to anonymous API usage statatics being collected by infusionsoft for the following reasons. 
* To provide API usage information to help us create a better plugin. 
* To engage API throttling in the event too many API requests are made within a short period of time.
By using [Your Plugin Here] you also consent to the use of [Your Proxy Site] as a connection service between [Your Plugin Here] and Infusionsoft. We reserve the right 
to refuse any API authentication requests made and collect anonymous usage statistics.
However, any API requests made by [Your Plugin Here] will communicate directly with Infusionsoft and forgo [Your Proxy Site]. [Your Proxy Site] only acts as a communication 
service between [Your Plugin Here] and Infusionsoft during the initial Authentication procedure and subsequent refreshing of autentication tokens. No client information of any kind, such as names, email addresses, or phone numbers 
is ever sent through [Your Proxy Site].

Infusionsoft Proxy Service

This plugin is for Infusionsoft Wordpress plugin developers only. Setup your WordPress as a super fast Proxy service for your wordpress based Infusion …

Geek Goddess

NOTICE: This plugin will no longer be supported nor updated. Infusionsoft has now added Google’s reCaptcha into their forms natively, so this plugin is no longer needed.
Infusionsoft® has a native captcha you can insert into web forms, but it’s not user-friendly, blocks submissions, and is ugly. With the new reCAPTCHA API, Google has released a captcha that the bulk of your users will only have to check a box to pass, optimizing opt-ins while protecting you from inserting spam into your Infusionsoft automation.
As a bonus, activating this plugin in an Infusionsoft web form will also set up basic HTML5 form validation for it.
Requires PHP 5.2+ for json support

GG Infucaptcha reCaptcha for Infusionsoft

Inserts Google’s new reCAPTCHA into Infusionsoft web forms

Infusionsoft Proxy Service vs GG Infucaptcha reCaptcha for Infusionsoft