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

paid action
Create an Image ad to appear on the Home tab in the Facebook Messenger app.

Requirements
You need this to get it done:

Headline
A short headline to grab the audience's attention and briefly explain what your ad is about (maximum of 25 characters.)
Text
A short description to accompany your ad (maximum of 90 characters.)
Image
File format: .jpg/.jpeg or .png
Ratio: 16:9 or 1:1
Minimum width: 254 pixels
Minimum height: 133 pixels
URL
The link you wish to include in your ad (where you would like to send your audience to.)
Call-to-Action
Decide which type call-to-action button you want on your ad (e.g. Learn More/Contact Us/Download/etc.)
Target Audience
Decide on the audience you want your post to reach (gender, age, location, interests, etc.)
Duration and Budget
Choose how long you want your ad to run and what your daily budget is.
Payment
Choose currency, enter payment details and pay.
Requirements missing or found errors? Report

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

0
Facebook Ads Help Centre - Messenger ads
Information about Messenger ads and how to set them up.
Official
0
Facebook Ads Guide - Image (Messenger Inbox)
Specifications and requirements.
Official
0
Facebook Photo Ads
Information about photo/image ads - when and how to use them.
Official
0
Facebook Messenger Ads
Information about Messenger ads - when and how to use them.
Official
Link missing here or found errors? Improve How-Tos