Salmonia for GAS

Salmonia2.js

function Salmonia() {
  const iksmSessions= JSON.parse(PropertiesService.getScriptProperties().getProperty('IKSM_SESSION'))
  const apiToken = PropertiesService.getScriptProperties().getProperty('API_TOKEN')
  let jobNum = JSON.parse(PropertiesService.getScriptProperties().getProperty('JOB_NUM'))
  
  iksmSessions.forEach(function(iksm_session, index) {
    const present = getJobNumFromSplatNet2(iksm_session)
    const preview = Math.max(parseInt(jobNum[index]), present - 49)
    Logger.log(iksm_session, present, preview)
    
    if(present != preview) {
      for(let job_num = preview; job_num <= present; ++job_num) {
        Logger.log(`${iksm_session}: ${job_num}`)
        const result = getResultFromSplatNet2(iksm_session, job_num)
        Utilities.sleep(5000)
        setResultToSalmonStats(result, apiToken)
      }
    } else {
      Logger.log(`${iksm_session}: No new results`)
    }
    jobNum[index] = present.toString()
    PropertiesService.getScriptProperties().setProperty("JOB_NUM", JSON.stringify(jobNum))
  })
}

function getJobNumFromSplatNet2(iksm_session) {
  const url = "https://app.splatoon2.nintendo.net/api/coop_results"
  const cookie =`iksm_session=${iksm_session}`
  const options = { headers: { cookie }}
  const response = UrlFetchApp.fetch(url, options);
  if (response.getResponseCode() != 200)
    throw new Error("Invalid/Expired iksm_session.")
    
  const json = JSON.parse(response.getContentText());
  return Math.round(json["summary"]["card"]["job_num"])
}

function getResultFromSplatNet2(iksm_session, job_num) {
  const url = `https://app.splatoon2.nintendo.net/api/coop_results/${job_num}`
  const cookie =`iksm_session=${iksm_session}`
  const options = { headers: { cookie }}
  return JSON.parse(UrlFetchApp.fetch(url, options).getContentText())
}

function setResultToSalmonStats(result, apiToken) {
  url = "https://salmon-stats-api.yuki.games/api/results"
  const headers = {
    "method": "post",
     "contentType": "application/json",
     "payload":  JSON.stringify({results: [result]}),
     "headers": {"Authorization" : `Bearer ${apiToken}`},
     "muteHttpExceptions": true
  }
  const response = UrlFetchApp.fetch(url, headers)
  if (response.getResponseCode() != 200)
      throw new Error("Invalid api-token.")
}

1. Get iksm_session and api_token using by Salmonia
2. Open GAS and New project
3. Copy and paste the above script
4. Save it
5. Open File -> Project properties -> Script properties
6. Set the value of properties

Property	Value
IKSM_SESSION	["YOUR IKSM_SESSION"]
API_TOKEN	YOUR API_TOKEN
JOB_NUM	["0"]

7. Open Edit -> Current project's trigger
8. Click Add trigger
9. Minutes based timer -> Every 1 minute -> Save
10. Done!