How to Invite Colleagues to Sign a Group Card

Separate signing from final delivery

A signer is a colleague who contributes a message, image, GIF or video before the group card is sent. The recipient is the person who receives the finished card. Keeping those roles separate prevents a common coordination mistake: circulating the recipient delivery details instead of the signing link.

After purchasing a group card, open Purchased Cards . The card row shows how many people have signed, its scheduled date and its delivery status. Select Link to copy the signing URL. The same URL can be shared in an email, chat, intranet post or calendar invitation. People do not need to become organisation members just to sign.

Give every invitation enough context

A useful invitation says who the card is for, why it is being created, when signatures close and what kind of contribution is welcome. State a signing deadline earlier than the actual delivery time. That buffer gives the organiser time to review the card, correct layout problems and deal with late requests without moving the recipient celebration.

Avoid forwarding a bare link with no explanation. For workplace cards, say whether messages should be suitable for a broad internal audience. If the card is password protected, share the password through an appropriate channel and make clear that the link and password should not be posted publicly.

Use reminders as a small campaign

Happy Tree Cards gives the organiser a stable card link and a live signature count. Use those together to run reminders through the communication channel your team already watches. A good pattern is an initial invitation, a short reminder midway through the signing window, and one final message on the closing day. For a short-notice card, one invitation and one final reminder are usually enough.

Keep the same link in every reminder and change the message rather than creating parallel threads. Mention the remaining time and, where appropriate, the current number of signatures. Do not shame people who have not contributed or reveal who has and has not signed. The goal is to reduce friction, not create another compliance exercise.

Send private invitations through Slack

Professional and Unlimited organisation plans can connect a Slack workspace. An organisation administrator sets this up from the Integrations section of Organisation Settings . Once connected, active organisation members can select Invite to Sign on an eligible organisation card in Purchased Cards.

Search the workspace user list, select the intended colleagues and send the invitations. Each person receives a private Slack message with the signing link and a card thumbnail. The primary and secondary card recipients are excluded from the picker, helping protect the surprise. Invitations are available while the card can still accept signatures: before delivery and before its scheduled send time has passed.

Make Slack invitations dependable

Connect Slack with the workspace that contains the intended signers, and keep the integration under a current administrator. The app needs permission to read eligible users, open direct messages, send messages and upload the thumbnail. If the interface asks for a reconnection after permissions change, an administrator should reconnect before retrying the invitation.

A batch can partly succeed. The result distinguishes sent, already sent and failed users, so retry only the failures shown. Someone may be absent from the picker if they are the card recipient, are not an active human workspace user, or do not expose the required email information to the integration.

Watch the deadline and card state

The signature count in Purchased Cards is the quickest progress check. Open the card periodically to check spacing and page flow, especially after image or video contributions. If the card is scheduled, stop chasing signatures with enough time to review it. Once the send time passes, signing and Slack invitation controls may no longer be available even if someone still has an old invitation message.

If more time is genuinely needed, use Admin on the card before delivery to adjust its schedule. Tell signers about the revised deadline so the link, reminder text and actual send time remain aligned.

Protect the recipient experience

Do a final review for duplicate messages, unfinished placeholders, private information and content that does not suit the occasion. Organisation moderation can assist, but it is not a substitute for the organiser reading the card. When the card is ready, let scheduled delivery run or use the card administration controls for an immediate send according to your organisation policy.