authorization: ********************{
"phone": "string",
"groupId": "string",
"message": "string",
"delayMessage": 0,
"delayTyping": 0
}curl --location --request POST '/messages/instances//plain-text' \
--header 'authorization: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"phone": "string",
"groupId": "string",
"message": "string",
"delayMessage": 0,
"delayTyping": 0
}'{
"messageId": "4238742333322765CCD245"
}