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

Requirements
You need this to get it done:

Header Background Image (Store Page/Channel)
File format: .png
File size: 300KB
Dimensions: 880 x 100 pixels
Header Logo Dark/Light Theme (Store Page/Channel)
File format: .png
File size: 100KB
Dimensions: 300 x 60 pixels
Store Trailer Video (Store Page/Channel)
File format: .mp4
File size: 15MB per minute
Dimensions: 1280 x 720 pixels
Store Carousel Image (Store Page/Channel)
File format: .png
File size: 1MB
DImensions: 1920 x 1080 pixels
Inline Banner (Store Page/Channel)
File format: .png/.gif
File size: 1MB
Dimensions: 600 pixels wide
Hero Backsplash Image (Hero Carousel & Directory)
File format: .png
File size: 1MB
Dimensions: 2480 x 1000 pixels
Hero Video (Hero Carousel & Directory)
File format: .mp4
File size: 15MB per minute
Dimensions: 1280 x 720 pixels
Tile Art (Hero Carousel & Directory)
File format: .png
File size: 1MB
Dimensions: 1280 x 720 pixels
Preview Video (Hero Carousel & Directory)
File format: .mp4
File size: 5MB
Dimensions: 640 x 360
Box Art (Hero Carousel & Directory)
File format: .png
File size: 1MB
Dimensions: 600 x 800 pixels
Hoverstate Video (Activity Feed)
File format: .mp4
File size: 5MB
Aspect ratio: 16:9
No audio
Splash Image (Activity Feed)
File format: .png
File size: 1MB
Aspect ratio: 16:9
Application License Fee
This is currently a one-time fee of $25 (USD)
Team
Create a team and invite the users who you are developing your game with (users must have two-factor authentication enabled.)
Create App
Create a new app inside Discord's Developer Portal. All apps on Discord for games must be owned by a team, so make sure to select the team you created.
Requirements missing or found errors? Report

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

0
Discord Developer Portal - How to Get Your Game on Discord
Official guide for developers about how to get your game on Discord.
Official
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Discord Developer Portal - Store
Official documentation about Discord's Store Manager.
Official
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Discord Support - Game Dev Store Pages
Useful information about setting up the store page/channel for your game.
Official
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Discord Support - Sell Your Game on Discord
Official information about selling games on Discord.
Official
Link missing here or found errors? Improve How-Tos