Apple Developer Account enrollment language

You can simply let the Safari membership term run out, as it doesn't look like Apple has given people an easy way to do this. Your best bet at cancelling it immediately though is to call Apple directly at 1-800-633-2152 and ask for them to cancel it.

As mentioned on iTunes Connect:

To setup a new bank account on iTunes Connect, take the following steps:

1. Access the Contracts, Tax and Banking module
2. Click on either the "Set Up" or “View/Edit” link in the Bank Info column
3. Click on the "Add Bank Account" link
4. Select your bank country and click "Next"
5. Enter the relevant bank code (local clearing or Swift code) or look up your bank, and click "Next"
6. Confirm your bank selection and click "Next"
7. Enter your bank account information and click "Next"
8. Review the confirmation screen, select the check box at the bottom of the screen to certify your information, and click "Save"
9. On returning to the bank account selection screen, select your new bank account from the drop down list, and click "Save"