Sandbox Workflow

Hello,

i am testing the plugin before going live in the Sandbox mode
and i got the following problem. After i successfully send the
payment using the ios Sandbox App i get the redirect to the
website at the “Order completed” screen but the order status
remains “Waiting for Payment” and it is not marked as Payed.

Is this somehow part of the workflow and i have to take some
additional steps or something is going wrong somewhere?