All the answers to the all the important questions.
No. You do not need a credit card to begin using Hrbr.
Simply sign-up (with a verifiable, valid email address) and you can begin to use the current release of the FULL platform immediately.
Once we reach general release of the product, we will notify you as you approach your monthly usage threshold (your first 5 million messages are free) so you can provide payment information and enjoy uninterrupted access to the Hrbr tools and platform.