How thuttu.com works? How they take data from other website? - e-commerce

How thuttu.com getting product details with MRP price and current price? and also how they getting money from filpkart, Amazon, Paytm, Snapdeal, etc..

They are very more than likely part of each sites affiliate networks therefore they have access to the respective APIs. As for how they make money, when a user clicks on an item they are redirected to the sellers site, Amazon.com for example, if they purchase that item (or in most cases for most affiliate networks, any item) then they will receive a commission based on the purchase amount.

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Shopify API - Payments

I have been reviewing the API documentation for Shopify and am trying to figure out if the cost of an item selected from the 'Store' can be passed in a Get command back to a different website so a different website can charge for the Item along with other charges from a website ...and then once the payment goes through on the website, send a POST to shopify that the sale was complete and proceed with fulfilling the order?
Our software is newspaper software so we provide newspapers with subscriber web portals were customers can sign up and pay for a newspaper subscription.
We would like to offer the ability to add Single Sales items to what a customer purchases and we want to be able to do it in one payment transaction
I have reviewed the various Shopify API documentation but it is not clear if the API supports getting cost info and posting a successful charge back to Shopify to complete the fulfillment step. We are looking to be able to GET the cost for a selected single sale item passed to us from the Shopify API so that we can add it to the Amount we pass to the Payment Gateway we integrate with and when the payment goes through, send Shopify a success on the payment.
The ultimate goal is to have a customer make one payment that can include single sales items as well as a newspaper subscription or day pass.
You should do a POST and create an Order using the Shopify API once (at your side) are sure the payment has gone through.

Paypal Express Checkout for Payflow Pro, Shipping and Tax update

In our scenario, we will use PayPal Express Checkout for Payflow Pro (important as it's different from PayPal Express Checkout).
Based on documentation, https://www.paypalobjects.com/webstatic/en_US/developer/docs/pdf/pfp_expresscheckout_pp.pdf, we have to provide shipping and tax values prior to knowing customer's Shipping Address.
I think it's not practical at all, so my question - Is it possible to Update (SetExpressCheckout with existing token) shipping/tax amount after address is chosen? Or somehow update (aka Instant Updates) shipping/tax values on PayPal pages?
Also if customer will go back to shopping cart page and add/remove products should customer go back to PayPal pages or we can only update Item Information and DoExpressCheckout with new amount?
The usual, most general-purpose recommended EC flow is:
Customer is on "View Cart" page and clicks the Checkout with PayPal button without having entered any address or other information into your site
SetEC with provisional shipping/tax amounts (could be 0)
Redirect customer to PayPal site
Customer chooses shipping address at PayPal and returns
GetEC to find out their selected address for the first time
Calculate any new shipping or tax and display summary on an "order review" type page (which could allow them to select from multiple shipping options, like air/ground, if applicable)
When the customer clicks a final "Place Order" sort of button, DoEC with the updated shipping and tax amounts.
Caveat: by default the total amount of the DoEC must be within 115% or $75 of the original SetEC amount, whichever is lesser. So if any of your pricing scenarios will exceed that threshold, the original SetEC should include some placeholder Shipping and Tax amounts, so that the final total is within 115%/$75.

Can shopify ScriptTag do that?

I considering integrating Shopify platform with third party loyalty/rewards provider.
For that I need to be able to allow customer to redeem his points at the moment of purchase.
This will involve adding extra control to Shopping cart, such as button [Redeem your points]
Can I use ScriptTag injection to:
Access information about currently logged on customer (customer email) ?
Modify current shopping cart total and have customer to pay less than total (let him apply loyalty points)?
Arbitrarily modifying the cost of a cart/order is not possible. Based on this restriction, I do not recommend trying to integrate/implement points card functionality.

Implementing transaction fee for auction sites using Google Checkout

Suppose there is an auction site that uses google checkout exclusively. How would one set things up so that when the buyer sends money to the seller google checkout sends something like 1% of it to the auction site much like how ebay charges a fee.
Google Checkout is a payment flow between one seller and one buyer. There is no support for automatic third party commissions.
You need to setup two separate transactions where the seller pays the auction broker the commission or listing fee.

One eCommerce Store using multiple PayPal accounts

I was wondering if someone knew of a way to theoretically have one eCommerce store to act as a medium where sellers can sign up and sell goods and use their PayPal account to receive payments instead?
So, Vendor A signs up, stores their PayPal information. Whenever a customer purchases items form Vendor A, the money goes straight to Vendor A's PayPal account rather than the eCommerce store acting as a middleman and later has to payout all the vendors.
Sounds possible to me, as long as you have the vendor's paypal information, however that would make your data a security risk, because you would have to store the paypal information for multiple vendors.