quickeebook gem : PUSH Customer.address, Customer.city, Customer.email fields in quickbook?

quickeebook gem : PUSH Customer.address, Customer.city, Customer.email
fields in quickbook?

I am using rails 3.2 and quickeebook gem for connecting quickbooks online.
Now the connection between my rails application and quickbook is done, but
I am facing new problem in it.
When I am trying to save customer.name in quickbook it is successfully
saving through my controller but if I try to pass fields like customer.id,
customer.email, customer.zipcode, customer.phone, etc. It is generating
errors. How can I save this data using quickeebook gem. How to fix this
error?