Field Constraints Quick Reference

Field	Type	Required	Description
text	string	-	Max 1024 characters. UTF-8. Non-Latin scripts may not render on all clients.
ttl_seconds	integer	-	Min 30, Max 43200 (12 hours). Values of 0, <30, or >43200 rejected.
phone	string	-	E.164 format mandatory. Example: +919886223778.
media.header.text	string	-	Max 60 characters (CTA and reply buttons). Text only — no image/video.
media.footer_text	string	-	Max 60 characters (CTA and reply buttons).
button count	integer	-	Max 3 buttons for interactive_reply.
button[].title	string	-	Max 20 characters per button title.
type	string	-	"send-direct" required on all message requests.