Apple sent me an email:

Apple was recently notified that your bank account information has been manually corrected by the processing bank for iTunes payments to vendor [my personal vendor id number]. Unfortunately Apple cannot continue processing payments with the current banking details provided in iTunes Connect. To avoid unnecessary payment delays or returns, please log into iTunes Connect and provide the correct account information in Agreements, Tax, and Banking. For instructions on how to update banking, see ‘How do I add or edit a new bank account?’ in iTunes Connect Resources and Help. After the banking changes have been entered in our systems, payments will resume.

Oh shiny.

I pull out my latest statement and off I go to update my details. Here’s my problem. I don’t know which vendor account Apple is referring to. Like many developers, I use multiple iTC accounts. When I log into each one, I cannot find the vendor ID. Argh.

To save you lots of time, do this:

• Log into any iTC account.
• Manually navigate to https://reportingitc2.apple.com/reports.html
• The vendor ID is listed next to your name. You should not have to re-authenticate when hopping from iTC to this page.

This helped me figure out which affected account was being referred to in the email and was able to update my info.

To update a direct deposit routing number, you need to hop into Agreements, Tax, and Banking. Click on the Bank Info > View button. You cannot edit the routing number in your existing Current Bank Account. Instead you need to Add Bank Account with the same details and the new routing number and then select that as your new account. Once you do it will take 24-48 hours for the change to go through and you will not be able to make further edits during that time.