quiero enviar dm a varias personas en holgura usando google script. Tengo todos sus webhooks. pero no sé el código para enviarlo usando varios webhooks.

mensaje de error: Excepción: Argumento no válido: [https://hooks.slack.com/services/XXXXX,https://hooks.slack.com/services/YYYYY]

 var ss =SpreadsheetApp.getActiveSpreadsheet(); var ji = ss.getSheetByName('Mailer'); var url = "[https://hooks.slack.com/services/XXXXX,https://hooks.slack.com/services/YYYYY]"; var ji_ticket =ji.getRange(3,3,ji.getLastRow()-2,1).getValues(); var linkticket = ji.getRange(3,4,ji.getLastRow()-2,1).getValues(); var total_ticket = ji.getRange("C2").getValue(); var status = ji.getRange("C1").getValue(); var payload = { "blocks": [ { "type": "section", "text": { "type": "mrkdwn", "text": ":bell: *Pending Ticket* :bell:" } }, { "type": "divider" }, { "type": "section", "text": { "type": "mrkdwn", "text": "Hi Leaders,\n\n"+ "There are " +total_ticket+ " tickets pending. Kindly click this tickets: "+linkticket //"\n\n\nThankyou" } } ] }; Logger.log(payload) var params = { "method": "post", "contentType": "application/json", "payload": JSON.stringify(payload) }; if(status=='Yes'){ return UrlFetchApp.fetch(url,params); } }```