zyBooks are steeply discounted for students, so most financial aid students initially subscribe directly using a credit card at zybooks.com, then reimburse themselves when their aid is disbursed several weeks into the term.
In rare hardship cases, we may defer payment for a few weeks. Email email@example.com to request a deferment.
Or if you prefer, you might first check whether your bookstore sells zyBooks prepaid access keys, in which case you might use your school financial aid account to purchase a key from the bookstore. (Info about prepaid access keys). (Info for bookstore representatives).
By the way, the first chapter is free, so students can immediately start reading and doing activities even before paying or requesting deferment. Note though that instructors can only see that already-done activity after the student subscribes.