Collaborative Calculation and Data Science

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CoCalc now has **Cash Voucher Codes**. These are single-use codes that you can purchase and make available to somebody else, who can then redeem them at https://cocalc.com/redeem for that amount of credit on their CoCalc account.  They can then buy anything in CoCalc using that credit, including [upgrade licenses](https://cocalc.com/store/site-license), [dedicated VM's and disks](https://cocalc.com/store/dedicated), [pay-as-you-go project upgrades](https://doc.cocalc.com/paygo.html), [student-pay course upgrades](https://doc.cocalc.com/teaching-upgrade-course.html#students-pay-for-upgrades), GPT-4 chat evaluation, more vouchers, etc.

To buy a cash voucher code, visit https://cocalc.com/store/vouchers and do "Add Cash Voucher".

<img width="910" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/619837ec-f829-4e4d-9e2f-2874c21c3d82">

then fill out the number and description, and customize the voucher codes:

<img width="1022" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/4ac0db78-0d8c-498c-9042-0c290b49a96c">

Then create your voucher codes:

<img width="998" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/2f872c31-14bf-4793-a611-4733e2f05aa8">

You get this:

<img width="960" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/038d42f1-9d95-4c6d-b14f-1e1ed8c56624">

Go to https://cocalc.com/redeem and redeem your own code... thus getting your money right back (as credit in your account)!

<img width="474" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/8029c576-a92f-4883-a8cb-e7d2be2239b8">

Note that this has no impact on my balance -- I just made a $5 voucher, which reduced my balance by $5, then I redeemed it, increasing my balance back to exactly where it was:

<img width="1045" alt="image" src="https://github.com/sagemathinc/cocalc/assets/1276278/2957520b-0405-4511-bc49-7d330199ec20">

I hope you find this useful.  E.g., if you're teaching a workshop and you want everybody to have an easy way to upgrade their projects for a few hours or use GPT-4 for more sophisticated AI help, you can just issue each participant a $2 voucher...