Unable to get client ids by AdwordsUser and unable to get AdwordsReport

[Adwords Trapica]

Hi,

I'm new to Google Adwords API and I would appreciate your help.

Since, for now, my clients on boarding manually by link their accounts to 
mine I don't have the option to get their refresh token but I have mine and 
I hope it's enough.
When I do the signup process by using URL: 
https://accounts.google.com/o/oauth2/v2/auth I do get my refresh token, but 
when I try to get my clients ids by using AdwordsUser I get zero 
results: {\"totalNumEntries\":0,\"Page.Type\":\"ManagedCustomerPage\"}.
Here's my code (Using node-adwords sdk):

let adwordsUser = new AdwordsUser({
    developerToken : token,
    userAgent : agent,
    clientCustomerId : clientCustomerId,    // xxx-xxx-xxxxx format
    client_id : clientId,                                 // 
xxxxxx.apps.googleusercontent.com
    client_secret : secret,
    refresh_token : refreshToken
})


let managedCustomerService = 
adwordsUser.getService('ManagedCustomerService', 'v201806')
let managedCustomerSelector = {
    fields: ['Name', 'CustomerId'],
    ordering: [{field: 'CustomerId', sortOrder: 'ASCENDING'}],
    paging: {startIndex: 0, numberResults: 
AdwordsConstants.RECOMMENDED_PAGE_SIZE}
}

managedCustomerService.get({serviceSelector: managedCustomerSelector}, 
(error, results) => {...

Any idea why I can't see the client ids of my customer?



Yet, I can see my customer's client ids in my web console and I'm trying to 
get insights about their campaigns.
Here's my code (Using node-adwords sdk):

let report = new AdwordsReport({
    developerToken: developerToken,
    userAgent: agent,
    clientCustomerId: clientCustomerId,    // Tried to use my customer's 
client id and tried to use mine
    client_id: clientId,
    client_secret: secret,
    refresh_token: refreshToken
})

report.getReport('v201806', {
    reportName: `${clientCustomerId} report for ${duration}`,
    reportType: 'CAMPAIGN_PERFORMANCE_REPORT',
    query: query,
    additionalHeaders: {
        skipReportHeader: true,
        skipReportSummary: true,
        skipColumnHeader: true
    },
    format: 'CSV'
}...


but I get: eportDownloadError.INVALID_PARAMETER ... Missing client 
information
Please advise.

Thanks,
Joab

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