User does not have access to portal_secure_payment.

Only handle relative_url to do get unauthorized.

Tool is provided by erp5 bt5.

Periodicity calculation should only be based on Hosting Subscription
periodicity, and not hardcoded in a script.

Limit as possible number of modifications on open order line.

Subscription start date should be based on beginning of the slap workflow, to
ensure compatibility with old data.

Use the state value only.
Correctly handle destroyed subscription which has never been associated to an
open order.

Excuse to force-run slapos test suite.

Try to reduce the number of documents created.
Always set a stop date on the open order line.

Fetching 1 element is faster than counting all.