(DataFlex) Get XOAUTH2 Access Token from Google OAuth 2.0 Authorization Server

Obtains an OAUTH2 access token from the Google OAuth 2.0 Authorization Server. This is for Server to server applications using Google API's that need an access token. See https://developers.google.com/accounts/docs/OAuth2ServiceAccount

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoHttp
    Variant vCert
    Handle hoCert
    Boolean iSuccess
    String sIss
    String sScope
    String sOauth_sub
    Integer iNumSec
    String sAccessToken
    String sTemp1
    Boolean bTemp1

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // --------------------------------------------------------------------------------
    // For a step-by-step guide for setting up your Google Workspace service account,
    // see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
    // --------------------------------------------------------------------------------
    // Begin by loading your Google service account key (.p12)
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadPfxFile Of hoCert "c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12" "notasecret" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The ISS is your service account email address ending in gserviceaccount.com.
    Move "chilkatsvc@chilkat25.iam.gserviceaccount.com" To sIss

    // The scope is always the following string:
    Move "https://mail.google.com/" To sScope

    // The sub is your company email address
    Move "bob@yourcompany.com" To sOauth_sub

    // The access token is valid for this number of seconds.
    Move 3600 To iNumSec

    Get pvComObject of hoCert to vCert
    Get ComG_SvcOauthAccessToken Of hoHttp sIss sScope sOauth_sub iNumSec vCert To sAccessToken
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End
    Else Begin
        Showln "access token: " sAccessToken
    End

    // The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one.


End_Procedure