A working demo gives you a reason to continue. Production readiness requires evidence about permissions, identity, event handling and the people responsible for the thread. Write those requirements before the trial so a pleasant interface cannot stand in for a complete result.
Specify the direction and identity
Identify every point where your business initiates a conversation. Sendblue’s inbound plan and LoopMessage’s optional initiation show why “API access” alone does not resolve this. Get the permission and current allowance for each journey on the quote.
Name the sender customers will see, including Android fallback. Confirm whether the test number differs from production and whether a dedicated number can be retained or moved if your vendor relationship ends.
Exercise the missing events
A sandbox may not expose all production callbacks. Verify which environment sends real webhook events before promising an end-to-end trial. Capture accepted requests, subsequent provider records, receipts and incoming replies as separate facts.
Test duplicated events, an unexpected attachment and a request that times out after dispatch. Do not invent an idempotency header: use only documented provider mechanisms. If the result is unknown, reconcile it before retrying. This is a suggested evaluation plan, not testing we claim to have performed.
Make an operator finish the conversation
Give a staff member ownership of a thread and verify that the automated agent stops responding when it should. Check where the full context appears, how the handoff is recorded and whether after-hours requests get an understandable response.
Finish with a small, consented live pilot using the purchased plan and representative devices. Agree on the evidence that counts as acceptance. A vendor’s performance claim, a sandbox send and a real customer reply answer different questions; retain each result with its limits.