VBA example
Here's a simple VBA example that allows you to send an SMS to a single number.
Sub SEND()
Set objHTTP = CreateObject("WinHttp.WinHttpRequest.5.1")
Dim Recipient As String
Dim Message As String
'Set vars where phone numbers and msg are set in your sheet'
Recipient = Range("A5").Value
Message = Range("B5").Value
Url = "https://api.smsfactor.com/send?text=" + Message + "&to=" + Recipient
objHTTP.Open "GET", Url, False
objHTTP.setRequestHeader "Authorization", "Bearer YOUR_API_TOKEN" 'Your Token'
objHTTP.setRequestHeader "Accept", "application/json"
objHTTP.SEND ("")
End Sub