MVC3: site access via À la carte e-commerce monthly subscriptions - asp.net

I know how to easily control who can view what in a site by using the membership and roles feature. However, I now want to take this a step further and allow people to purchase access to specific features, billed monthly. Basically I need a combination of an e-commerce site that sells products, mixed with a role based membership site. Below is an example of a scenario we are looking to solve:
Our site has the following sections (products):
learn spanish, learn french, learn german, learn english
We now want users to be able to buy access to just what they want. So we can give a price to each of these products.
We would also like to offer bundling discounts, so buy 2 and get $10 off. Buy all 4 and get 25% off. This should be automatic, but if needed, a coupon is fine as long as it can figure out the logic of making sure they have the correct item
We would like to restrict discounts so that we can offer them only to the first 100 people or from the days X to Y (ideally a coupon system maybe)
We want users to be "grand fathered" if we update pricing. So if someone signed up for all at $60 a month, and we later make it $100, they stay at $60
This is a monthly service so we would need it to create our invoices and work with our CC processor. I know this will involve us making an API if the system doesn't include our processor.
If possible we would love for "Pro-Rated" features, so if they currently are paying for 3 items and they have 13 days left till next billing date, they can add the 4th and pay a pro-rated amount.
All of these features are very common features for an advanced membership site, however I am just not sure what to search for to find a framework like this. I can find eCommerce and I can find role based membership, but have yet to find a decent combination of the two.
Licensed is fine as long as it works for what we need.
Thanks in advance

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Make Ubercart Attributes set price, not change the price

I have been searching for this all over the internet, but haven't came up with the solution just yet.
On my Drupal 7 installation I've happily used Ubercart for a while now, but I'm going to sell software from now on.
I'd like to use attributes to change the price based on the amount of computers and licence experiation date (years from now).
The prices don't always rise the same way, so I can't set an increase of 10% with every year.
I'd like to fill out a price table and when the user makes his choice, he gets the price right.
This is the website I'm talking about (example product): https://www.xsbyte.com/catalog/73
It seems not possible to do this, you could fill out a new price for a new object, or could just make a new product, but that was not what I was looking for.
I ended up using WooCommerce (Wordpress) and integrated both systems, so customers get features like single-logon and shared customer address and payment details (if applicatable).

Can I have 2 shopping carts that take 2 separate currencies on one site?

We are in the process of revamping our site. We market a product in the US and Europe. At first we wanted the two prices in the US dollar and UK pound to show side by side but hard coding in round numbers won't allow it. The developer has suggested duplicate .com and .uk sites where a sniffer recognizes the appropriate IP. My partners don't want to duplicate costs of 2 sites. So is it possible to have two separate shopping carts that take different currencies linked to one site?
Are you using a plugin for ecommerce, or building your own? If you use a third-party solution, like WooCommerce, they usually offer a feature to support multiple currencies. For example http://www.woothemes.com/extension/currency-converter-widget/ And that one does live currency lookups so you don't have to have the prices hard coded.

Change product currency and price in ubercart-based drupal with variable price

I run a donation site in Drupal, that soon needs to expand to another country, and will need to support not only switch of language, but also currency. The thing is, users donate money to charity in their own currency, and this needs to be summed up to a total amount of donations shown to the current user in their own currency.
A fundraiser is an ubercart product that users "buy" at a variable price, thus making a donation. I am creating a custom Donation node with each ubercart purchase containing CCK fields such as the amount donated.
So what I need to allow is this:
A user makes a donation in, say, Euro, EUR
Another user makes a donation in Danish Kroner, DKK
A third user views the site in US locale and should see all the donations converted to USD based off of the exchange rate at the time of donation for all the donations.
And it gets a little more difficult: We are using the UC variable price module to allow users to donate any amount they see fit.
So can this be accomplished using Drupal and Ubercart, and if so, how?
I am afraid that you will end up writing your own plug-in to convert currencies.
The problem with the conversion is, this is something that changes but you already realized this. The only source of exchange rates I know is Oanda and they seem to have their own Data Feed.
Unfortunately, I cannot tell if you would be allowed to use it for free, I believe it would be good to ask them.

Is there a third-party business card designer widget for a website?

I am a part-time IT worker for a university print shop. Over the years my predecessor and I have created a very simple, custom ASP.NET website to allow employees to submit print orders, which we then process and deliver.
We have long allowed employees to order business cards, but we only let them enter a few fields - their name, phone number, fax number, etc. - which we then print out on a common stock. But my boss would now like to offer employees more customization, from uploading a photo of themselves to include on the business card, to adding an optional message at the bottom of the card which the employee could customize by entering the text, the font, the color, and so on.
This is a bit beyond my skillset. Are there any out of the box third-party products we could buy (or that may be freeware) that would provide a rich design experience? Ideally the customer would have a rich canvas like with Vistaprint.com or any other sort of commercial, direct to consumer, online business card company.
Out of curiosity, why not get in touch with the computer engineering department? One of my biggest gripes about my college experience was never getting any hands-on experience (that is, until senior-year when they threw us into a real-world project using Java and a few other languages that we were never taught.) This project is not difficult at all, and I suspect that they could get it done in about a month's time.
They should be able to produce something that not only allows the user to use a custom image, but they could also allow users to move the Name, Address, etc. anywhere on the card, etc.

Is it viable to use Drupal/Ubercart for an international store? Do any payment gateways support it?

I am picking tools to use for an international store. Company sells training and products in North America, Europe and a few other places. The existing store in the United States (Drupal/Ubercart/Authorize.net) works great and serves all their needs.
Displaying product prices in different currencies are relatively easy to set up, and you can display the correct currency symbols and values depending on where services are rendered, where people want to ship to, etc (useful modules include uc_multiple_currency, uc_multiprice, uc_cck_currency).
Are there viable Ubercart solutions to sell to other international markets using the same storefront? It is possible for any user to buy services/products through the US store, but paying in USD for a service offered in e.g. the Netherlands, when dealing with people based in the Netherlands is not acceptable.
The only payment gateway I could find that would accept payment in multiple currencies is Paypal. However, I am looking for a solution that would accept credit cards from international users and charge them in the correct currency. Authorize.net works great - will accept cards from anywhere and process them, but all transactions is in USD. It would be extremely problematic to charge someone €250 on the site and their final charge (after currency conversion) being e.g. €250.65 or something like it because of a delayed conversion.
Numerous people have asked this question, with very few useful insights and solutions (see for example here, here, and here, which presents a workaround-ish way of doing things).
To be clear: Displaying prices in different currencies is easy. How can I bill credit cards internationally using the correct currency through a gateway that supports it, without having to do conversions?
I have been through the same thing recently, but ended up making my own module to do the price handling. If it's done right, the prices will be displayed correct, even for order total etc. (See the hook_uc_price_handler)
This means that you will need to do two things to handle your problem.
Make sure the order only contain 1 currency, so you don't have one item costing €100 and another costing $100 (what would the total of that order be?) You could handle this by doing currency conversion if you wanted to, I believe that is how one of the modules you listed works.
When the payment is processed you need to send the correct currency to the payment provider. This already needs to be done in most cases as payment providers usually are able to collect in various currencies. Since most do the payment process via a hidden form that redirects or a inline form with hidden fields, you should be able to use hook_form_alter to set the currency to what you want. Depending on the payment module, this may be hard or easy.

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