Collaborative Calculation and Data Science

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CoCalc's new purchasing system is now live!  Instead of directly buying licenses, you add a credit on your account.      You can then use that money **in a massively more flexible way** to buy licenses, pay-as-you-go upgrades of projects (a new thing), use GPT-4 (new), GPU's (coming soon), and we have many more plans.  There's a log of exactly what you purchased, with daily and monthly statements, and as you make purchases your balance goes down.  

Payments to add credit now work in your local currency anywhere in the world with a wide variety of local payment methods, instead of just credit cards!  You can also buy a subscription without enabling any form of automatic payments -- you just have to manually add credit to cover the subscription periodically.  

Another massive improve in our license system is that if you purchase a licenses and find that  you need to increase or decrease the RAM or disk space or run limit (number of upgraded projects) or anything else at any time, you can just directly *edit the license* and your account will be debited or credited accordingly.   If you need a license for only a week,  or to extend an existing license, you can also just do that at any time using the balance in your account (you're charged the prorated difference).   

I think this is much better than what we had before, and it's now fully live as you can see at 

- https://cocalc.com/settings/purchases
- https://cocalc.com/settings/subscriptions
- https://cocalc.com/settings/statements

and in the screenshots below.  These improvements to purchasing are the result of feedback from thousands of users over many years.

## Purchases:

<img width="1185" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/45ef10f7-f8df-48db-ad10-d1471bb7338e">

## Statements:

<img width="1185" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/5523191a-46eb-4317-aa22-5f013c9c4ca0">

## Edit a license

<img width="878" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/14996515-7135-4962-b8e8-3556f2bacc89">

<img width="614" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/5c049cd8-bee4-4129-91d9-b33d9e2d28d4">

## Pay as you go project upgrade

<img width="954" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/4b30c488-5ed2-4800-a690-50bfe345c13c">

## GPT-4

<img width="830" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/0919020b-6c6b-4918-97c7-7d5357fb9c72">


