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Your Concurrency Limit controls how many files you can have processing in parallel with the API at any given time. You can submit as many files to the API as you'd like, but if your Concurrency Limit is 1, the API will only process 1 at a time (for example).
Once a credit card is attached to your account, all billing is Pay-as-you-go. You deposit funds in your account, and those funds are drained as you use the API.
Your API Token
Your concurrency limit:
Funds in your account: $