Allow to require any header.

Configure GET/POST on /instance to require application/json in Accept and
Content-Type headers.

It is not used by Vifib.

requestSoftwareInstance request exactly 7 arguments.

This reduce the load of the server

Merde...pushing too fast.

Dates on payments are not set by builder, so while playing in test set it.

Computer might not have access to it.

Use common responseSupport which adds all expected headers and supports
anonymous access, so OPTIONS can be simplified.

Convert to XML.

getId will nicely wait until methods will be executed, there is no need to use
serialize, which will commit new transaction.