[Taler] Merchant-Self-Provisioning on Demo-Site

[Özgür Kesim]

Hi all,

I just pushed my changes to taler-merchant-demos.git¹
and sandcastle-ng.git² for a new service that provides
self-provisioning of a merchant-instance on our
demo-site demo.taler.net (service not online yet).

This will allow any frontend developer---who just wants
to integrate payment with Taler into their website and
test it, but does not want to setup a full a merchant
backend---to simply provision a merchant-instance on
the demo site via the new tab "Self-Provision" on the
landing page (not online yet!).

The service will create a new merchant instance and a
corresponding bank account and return the merchant-id
and access-token. With that information, the developer
can start integrating their frontend with their new
merchant instance on
  backend.demo.taler.net/instances/<merchant-id>
and use the SPA to change orders, inventories and
templates etc. Also, they are able login into the demo
bank as the merchant and see incoming wire transfers
from the exchange.

Once mattermost.taler.net is online again, I will
coordinate with our dev- and infra-team to merge and
tag the code and make adjustments to nginx-settings in
order to bring this service online on demo.taler.net
and announce it also on ich.taler.net.

Cheers,
Özgür

¹) https://git.taler.net/taler-merchant-demos.git/log/?h=dev/oec/provision
²) https://git.taler.net/sandcastle-ng.git/log/?h=dev/oec/provision


PS:
Later I will also implement a tool to remove unused
merchant instances.

PPS:
I hope I have not killed any application to our
NGI TALER Open-Call with this implementation...
(see https://nlnet.nl/taler/)