Amazon API -- how to fetch all reviews of a particular user - amazon-product-api

There is now a mechanism in the Amazon Product API to retrieve all reviews for a particular product. I'm interested in the opposite: fetch all reviews done by a particular user, for all the products she has reviewed. Is this possible directly from Amazon, or are there any third party APIs that allow this? Thanks.

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Spring Boot handeling requests one after another

for an endpoint that assigns jobs to employees, I would like the requests to the endpoint to be processed sequentially so that it is not possible for multiple employees to sign up for a job.
Is there a way to do this ? Or maybe even something better ? How does this work on shopping sites with carts ? These often also need to check first if the product is available and prevent two users from buying the last product.
Thanks a lot!

Amazon API to get number of listings for a specific product

Is there an Amazon API, which can provide me with the total number of product listings based on a given search?

Service for accessing multiple user cloud storage accounts from single server

I'm working on a free educational web app for school music teachers and students that will allow them to collaborate and share mp3 recordings. Since earning revenue is not the goal, I'm looking for ways to reduce file storage costs. A single teacher assignment might produce hundreds of recorded responses. Instead of saving these recordings to my own storage (or to a service like Amazon's S3), I was wondering if there are any cloud storage services that teachers could sign up for - similar to something like Google Drive - and which they could then give my server app access to for storing their class's recordings. I'd still manage the info for the recordings and other data in a single database on my own server, but I'd save any large files to the shared storage provided to me by each teacher. I haven't found any examples of this sort of thing with services like Google Drive or Dropbox, but if it's possible with those or any other services, I'd appreciate a link to some info. The expectation would be that a teacher could pay the storage company for its service according to the school's usage. The service would have to be simple for teachers to sign up for and provide me access to, which I think puts some of the developer-oriented services out of reach.
Suggestions for different strategies are also welcome. I'd prefer not to handle financial transactions (so I don't want to rent space to people).

Extract shipping rate from Amazon Product API

I am developing a price comparison site for books sold in Amazon, and I want to calculate the estimated price with shipping rate included and display to the user.
I searched the Amazon API manual and cannot find a response group or item that mention about shipping rate, is there an item for that?
You cannot get the shipping rate info via Amazon Product API.
The reason for that is, I guess, the fact that the shipping rate depends on several factors (methods of shipping, type of an Amazon user (prime user, for example), location of the user etc), which are unknown at the time of the product fetching via API.

What's the best way to provide a web shop application to multiple customers?

If I had a web shop application and I'd want to provide it to multiple customers, who sell their products from the web shop, how would I design such application when it comes to deployment?
One application with one database on a central server. Every data row has a customer ID which states to which customer ("shop instance") it belongs.
OR
Every customer has its own copy of the web shop with its own database and its own (virtual) server.
OR
[your idea here]
I would make it a "boxed product" - each customer has their own web shop and their own database. If one customer turns out to be as busy as Amazon, you can scale out their implementation easily (i.e. slam it on a dedicated server when it gets quite busy, then onto a server farm when it goes completely nuts). If you have a customer who feels very proprietry about their customer data (i.e. they don't want any chance of someone else getting to it) it will ease their mind to know that their data is in their own data store.
This also gives you a couple of sales options. A hosted solution, where you create and host their shop, and a licensed solution, where they host it on their own servers.