Generate a batch of unique vouchers. Each voucher will be created using {prefix}-{random code} format where code will be a random string of requested type and length. A prefix needs to be unique within a project.

Following code types are supported:

• digits
• letters
• mixed (digits and letters)

Allowed characters for each code type have been filtered to avoid typing mistakes. Maximum number of codes possible to generate in one batch request is 50 000.