The EIN? if so this is an Apple requirement for tax purposes. Seems to be a USA employer requirement.
On my form I declared as new business ....ebook publisher.
The Banking and Contracts section is for you to confirm your bank details...if/ when you sell items...Apple transfer your earnings less their commission, to your bank. The contracts are Apple requirements.
Its advisable to apply for EiN by telephone ..of you do the agents you will speak with are very helpful and will take you step by step through the forms. It takes about 10 -15 minutes. and they give you the number then and confirm i. writing.
Apple have other banking requirements for UK, Canada and Australia.