Uber Eats will not charge an additional processing fee outside of your order amount.
However, your credit card issuer and credit card company (i.e. Visa, JCB and MasterCard) may charge a processing fee when an international transaction made in New Taiwan Dollar.
You may contact your issuing bank for more information on the processing fee toward any international transaction. (Please note the foreign transaction fee may differ by the credit card issuer and credit card company)