Workflow payments are lost if user navigates away from the payment page

[proxeus-dev]

Subject of the issue

Currently, users will lose their workflow payment if they move away from the payment page.
A warning to stay on the page is now displayed to the user to prevent this behavior, however it can still happen.

Your environment

All

Steps to reproduce

• start buying a workflow,
• while in metamask, move away from the payment page or close your browser,
• continue the payment in metamask until confirmed.

Expected behaviour

Reopen Proxeus and observe that still cannot access the workflow.

Actual behaviour

Reopen Proxeus and if users start the same workflow, they are not proposed to buy it but allowed to start it.