no credit card required
based on your usage
If you have 900 messages per month, your monthly message costs are $0, since your usage is within the Free Tier.
If you have 8,400 messages per month, you exceed the Free Tier with 7,400 messages, which is rounded up to 8,000 messages. Your monthly message costs are (8,000 / 1,000 × $2.50) = $20.
If you have 20,000 messages per month and you have 450 flow elements, you exceed the Free Tier with 19,000 messages. Your monthly message costs are (19,000 / 1,000 × $2.50) = $47.50. You exceed the Free Tier with 200 flow elements, resulting in $2 additional costs per month. Your total monthly costs are $47.50 + $2 = $49.50.