Yes. Free Sandbox gives you 20 sandbox credits in a clearly limited testing mode so you can verify the flow before upgrading.
Product questions
Clear answers before you build.
Understand sandbox limits, sender options, OTP workflows, delivery failures, and upgrade behavior before connecting your application.
Question index
01
Setup
Sandbox access, connected numbers, and integration help.
02
Messaging
OTP, delivery failures, and controlled sending workflows.
03
Plans
Usage limits, upgrades, and production access.
Yes. Pay-as-you-go supports one connected number, Starter supports two, Pro supports five, and Business supports fifteen. Free Sandbox uses HookMessage-managed test numbers only.
Yes. OTP is one of the main launch use cases, alongside order confirmations, lead follow-up, and customer notifications.
Yes. HookMessage offers one-time integration help for teams that need setup support for a website, application, or ecommerce workflow.
Only as a controlled secondary workflow for opted-in customer lists. The product should not be positioned as an unlimited bulk sender.
The platform stops new sends for that billing period and prompts you to upgrade or wait for the next cycle. On Pay-as-you-go, extra usage is invoiced with the monthly bill.
The dashboard and API should show whether the failure came from limits, sender connection, API key, phone format, server error, or WhatsApp delivery. Failed sends should not consume a full credit when the platform never actually transmits the message.
Validate the workflow in the sandbox before sending production traffic.
Need implementation detail?