Action Details
Requirements and how-to articles for Pinterest's action:

On Pinterest, an article is a page that contains text, such as a news article or blog post.

Requirements
You need this to get it done:

Title (required)
Property (Open Graph): og:title
Property (Schema.org): name
Description: The article title. This title may be truncated, depending on length. All formatting and HTML tags will be removed.
Description (required)
Property (Open Graph): og:description
Property (Schema.org): description
Description: The article description or summary. This may be truncated, depending on length. All formatting, line breaks and HTML tags will be removed.
Type (required if using Open Graph)
Property (Open Graph): og:type
Description: Must take the value of "article" or "blog".
URL (required if using Schema.org)
Property (Open Graph): og:url
Property (Schema.org): url
Description: Canonical URL for the page (You can also specify canonical with standard HTML markup: <link rel="canonical" href="..."/>)
Date Published
Property (Open Graph): article:published_time
Property (Schema.org): datePublished
Description: The date the article was first published. The time should be in ISO 8601 date format.
Author
Property (Open Graph): article:author
Description: The article author. All formatting, line breaks and HTML tags will be removed.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

0
Pinterest Help Centre - Article Pins
Official information on Article Pins.
Official
0
Pinterest Developers - Article Pins
The official technical information on Article Rich Pin properties.
Official
Link missing here or found errors? Improve How-Tos