Credits measure your API usage. One credit equals 0.5MB of output data. For
example, files up to 0.5MB use 1 credit, files between 0.5MB and 1MB use 2
credits, and so on.
The maximum number of conversions allowed per minute.
The number of conversions that can run at the same time.
The maximum time the converter will wait for asynchronous JavaScript to
complete. This is separate from the overall conversion time limit of 60
seconds.