# Billing Questions
# How to bill?
EMQX Cloud charges based on the cluster instance specifications and message transmission network traffic, not the number of messages, and does not limit the use of API and data integrations.
For detailed billing rules, you can view Product Pricing
# How to top up？
You need to bind a credit card and the fee is charged monthly.
# How do I download an invoice?
EMQX Console (opens new window)，check
# How to get the coupons?
If you need to experience all the features, you can submit a ticket or email email@example.com to get in touch with us, and we will issue a certain amount of coupons based on your needs.