{ "$schema": "https://json-structure.org/meta/core/v0/#", "$id": "https://raw.githubusercontent.com/api-evangelist/at-and-t/refs/heads/main/json-structure/in-app-messaging-api-send-message-request-structure.json", "description": "SendMessageRequest schema from AT&T API", "type": "object", "required": [ "messageRequest" ], "properties": { "messageRequest": { "type": "object", "required": [ "addresses" ], "properties": { "addresses": { "type": "array", "description": "List of recipient phone numbers or email addresses", "items": { "type": "string" }, "example": [ "tel:+12125551234" ] }, "text": { "type": "string", "description": "SMS text content (up to 160 chars for SMS, longer for MMS)", "example": "Hello from the AT&T In-App Messaging API!" }, "subject": { "type": "string", "description": "Subject line (MMS only)", "example": "Greeting" }, "group": { "type": "boolean", "description": "If true, send as a group message", "example": false } } } }, "name": "SendMessageRequest" }