curl --location --request POST 'https://api.conexteo.com/messages/sms/contactlist?resumeBefore=true' \
--header 'X-APP-ID: <api-key>' \
--header 'X-API-KEY: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"external_id": "123456789-client",
"scheduleAt": "2019-08-24T14:15:22Z",
"shorturl": {
"mode": "unique",
"url": "https://www.google.com/"
},
"content": "Hello World",
"sender": "SENDER",
"contactlist": [
"1",
"2"
]
}'
{
"success": true,
"message": "message created",
"message_id": 123456,
"credits_used": 1
}