Mock sample for your project: LetMC Api V2, Basic (Tier 2) API

A product library is a representation of all the items that can be
displayed, put in a shopping cart and sold to a customer. Items may be
either producs or discounts.
A product is a synthetic construct, wrapping one or more variants (which is
the actual item being sold) Variants expresses different variations of
properties such as for example price, size or color. A discount will reduce
the total amount charged in a shopping cart. It can be used per item line,
or on the whole cart. It may reduce the affected amount by a percentage, or
by a fixed amount.
Together, the above types of entities makes up a complete library. The
library can be fetched as a whole through the library endpoint, where each
consecutive change applied to the library is available. Once the full
library is retrieved, only later events needs to be fetched to keep the
client up to date with the server
All path patterns "/organizations/{organizationUuid}/" can be replaced
with "/organizations/self/" for convenience as all endpoints are for
authorized users.

The Recommendation API returns information that sellers can use to optimize the configuration of their listings on eBay. Currently, the API contains a single method, findListingRecommendations. This method provides information that sellers can use to configure Promoted Listings ad campaigns to maximize the visibility of their items in the eBay marketplace.

Send an SMS with verification code and a custom message for authentication purpose. It helps merchants to minimize chargebacks and fraud for various kinds of payment method, such as credit card, paypal, cod and so on. Please visit https://www.fraudlabspro.com to learn more.

The price is a fundamental building block for your listing on Walmart.com. You can use the price management APIs to set up and manage the price for a given item

The Analytics API provides data and information about a seller and their eBay business. The resources and methods in this API let sellers review information on their listing performance, metrics on their customer service performance, and details on their eBay seller performance rating. The three resources in the Analytics API provide the following data and information: Customer Service Metric – Returns data on a seller's customer service performance as compared to other seller's in the same peer group. Traffic Report – Returns data that shows how buyers are engaging with a seller's listings. Seller Standards Profile – Returns data pertaining to a seller's performance rating. Sellers can use the data and information returned by the various Analytics API methods to determine where they can make improvements to increase sales and how they might improve their seller status as viewed by eBay buyers. For details on using this API, see Analyzing seller performance.

The REST API of BeezUP system
Overview
The REST APIs provide programmatic access to read and write BeezUP data.
Basically, with this API you will be able to do everything like you were with your browser on https://go.beezup.com !
The main features are:
Register and manage your account
Create and manage and share your stores with your friends/co-workers.
Import your product catalog and schedule the auto importation
Search the channels your want to use
Configure your channels for your catalogs to export your product information:
cost and general settings
category and columns mappings
your will be able to create and manage your custom column
put in place exlusion filters based on simple conditions on your product data
override product values
get product vision for a channel catalog scope
Analyze and optimize your performance of your catalogs on all yours channels with different type of reportings by day, channel, category and by product.
Automatize your optimisation by using rules!
And of course... Manage your orders harvested from all your marketplaces:
Synchronize your orders in an uniformized way
Get the available actions and update the order status
...and more!
Authentication credentials
The public API with the base path /v2/public have been put in place to give you an entry point to our system for the user registration, login and lost password. The public API does not require any credentials.
We give you the some public list of values and public channels for our public commercial web site www.beezup.com.
The user API with the base path /v2/user requires a token which is available on this page:
https://go.beezup.com/Account/MyAccount
Things to keep in mind
API Rate Limits
The BeezUP REST API is limited to 100 calls/minute.
Media type
The default media type for requests and responses is application/json. Where noted, some operations support other content types. If no additional content type is mentioned for a specific operation, then the media type is application/json.
Required content type
The required and default encoding for the request and responses is UTF8.
Required date time format
All our date time are formatted in ISO 8601 format: 2014-06-24T16:25:00Z.
Base URL
The Base URL of the BeezUP API Order Management REST API conforms to the following template.
https://api.beezup.com
All URLs returned by the BeezUP API are relative to this base URL, and all requests to the REST API must use this base URL template.
You can test our API on https://api-docs.beezup.com/swagger-ui\\
You can contact us on gitter, #BeezUP/API

The Catalog API allows users to search for and locate an eBay catalog product that is a direct match for the product that they wish to sell. Listing against an eBay catalog product helps insure that all listings (based off of that catalog product) have complete and accurate information. In addition to helping to create high-quality listings, another benefit to the seller of using catalog information to create listings is that much of the details of the listing will be prefilled, including the listing title, the listing description, the item specifics, and a stock image for the product (if available). Sellers will not have to enter item specifics themselves, and the overall listing process is a lot faster and easier.

The Account API gives sellers the ability to configure their eBay seller accounts, including the seller's policies (the Fulfillment Policy, Payment Policy, and Return Policy), opt in and out of eBay seller programs, configure sales tax tables, and get account information. For details on the availability of the methods in this API, see Account API requirements and restrictions.

The Account API gives sellers the ability to configure their eBay seller accounts, including the seller's policies (the Fulfillment Policy, Payment Policy, and Return Policy), opt in and out of eBay seller programs, configure sales tax tables, and get account information. For details on the availability of the methods in this API, see Account API requirements and restrictions.

The Feed API lets sellers upload input files, download reports and files including their status, filter reports using URI parameters, and retrieve customer service metrics task details.