If you go to your payments tab on the website, it will tell you about how long it takes each MSP you've completed a job for to release payment. For shops that I've completed, some have taken less than a month, while others take a month or more.

For the Mission Scanner app, the MSP should provide you with your login information.

It's possible that you have requested the shop, but have not been officially assigned yet. You can see a list of pending requests if you go under the "Requests" tab on the iSS home page. Some shops are available for self-assign, while other requests need to be approved by the MSP.

There's a self-assign limit, but you can get more than 2 jobs if you apply and are assigned by a scheduler.