Who can join an order conversation?

Use a private group channel for a conversation about one order. An invited person can join a private channel under the invitation rules. A public group channel lets people join without an invitation. Your app still has to decide who is allowed to invite people and link an order to the right conversation.

Require a chat authentication token tied to the signed-in account, and give client apps only the access that account needs. Check the app’s channel-creation setting if customers should not be able to open their own rooms.

What can a newly invited person see?

Decide whether someone joining late should see replies from before they joined. Sendbird has a group chat history setting for this. A returning member opening existing messages is a separate case. If you use an ephemeral group, messages are not saved for later.

Choose a private, saved conversation for an ongoing order discussion. Use a separate push preference to control alerts for disconnected members. Muting an alert does not decide who can open the conversation.

How do you review an invitation before using a real account?

Use a paper conversation about a fictional order. Draw one saved reply and use three invented accounts. Leave Sendbird and all notification services disconnected.

Let the existing member return
Show the buyer the saved reply when they open the private conversation. Mark the unrelated account as unable to open it.
Invite someone after the reply
Make the late member’s access follow the history setting you chose. If your policy hides messages from before joining, mark the old reply hidden and a later reply visible.
Separate chat access and alerts
Have a member turn off push for the conversation. Keep their access to new messages in the app. The paper result does not prove delivery to a device.

What does Sendbird count, and what can you export?

Sendbird advertises a 30-day Chat trial with up to 1,000 monthly active chat users and 20 simultaneous connections. Count people who connect to chat within 30 days and estimate the busiest moment separately. A person using two devices can contribute two connections.

The Starter 5K example lists US$349 per month billed annually or US$399 billed monthly. Sendbird’s API documents separate exports for messages, channels and users. Its pricing page lists Data export under Pro, while the FAQ calls it an Enterprise add-on unavailable on Starter or Pro. If you need an export, confirm access and the available history for the plan you intend to buy. Keep a record of which people belong to each conversation so you can check membership after a move.