SMS keyword opt-in

Keyword opt-in turns any surface — a poster, a receipt, a shop window — into a subscribe point. When someone texts your keyword to your number, they're subscribed and the opt-in is recorded, timestamped and documented.

Create a keyword

curl https://api.wezend.com/v1/sms-keywords \
  -H "X-API-Key: <key>" -H "Content-Type: application/json" \
  -d '{ "keyword": "vip", "reply_text": "Welcome to VIP! You'\''ll hear about drops first.", "tag": "vip" }'

• keyword — 1–40 letters/numbers, no spaces (case-insensitive).
• action — subscribe (default) or unsubscribe.
• reply_text — optional auto-reply confirming the opt-in.
• tag — optional tag applied to contacts who join, so you can segment on it.

List your keywords with GET /v1/sms-keywords.

After they join

The opt-in is a documented consent signal (who, what, when). Route new subscribers straight into a welcome journey so they get an instant first message. Set up a matching unsubscribe keyword (e.g. STOP) to honour opt-outs.