(PowerShell) Refresh QuickBooks OAuth2 Access Token

Demonstrates how to refresh a QuickBooks OAuth2 access token.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

# See Get QuickBooks OAuth2 Access Token 
# for sample code showing how to obtain a QuickBooks access token for desktop apps.

# This example assumes we previously obtained an OAuth2 access token for QuickBooks.

$jsonToken = New-Object Chilkat.JsonObject
$success = $jsonToken.LoadFile("qa_data/tokens/qb-access-token.json")
if ($success -ne $true) {
    $("Failed to load qb-access-token.json")
    exit
}

# The access token JSON looks something like this:

# {
#   "expires_in": 3600,
#   "x_refresh_token_expires_in": 8726400,
#   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
#   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
#   "token_type": "bearer"
# }

$oauth2 = New-Object Chilkat.OAuth2

$oauth2.TokenEndpoint = "https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer"

# Replace these with actual values.
$oauth2.ClientId = "QUICKBOOKS-CLIENT-ID"
$oauth2.ClientSecret = "QUICKBOOKS-CLIENT-SECRET"

# Get the "refresh_token"
$oauth2.RefreshToken = $jsonToken.StringOf("refresh_token")

# Send the HTTP POST to refresh the access token..
$success = $oauth2.RefreshAccessToken()
if ($success -ne $true) {
    $($oauth2.LastErrorText)
    exit
}

# The response contains a new access token, but we must keep
# our existing refresh token for when we need to refresh again in the future.
$jsonToken.UpdateString("access_token",$oauth2.AccessToken)

# Save the new JSON access token response to a file.
# The access + refresh tokens contained in this JSON will be needed for the next refresh.
$sbJson = New-Object Chilkat.StringBuilder
$jsonToken.EmitCompact = $false

$jsonToken.EmitSb($sbJson)
$sbJson.WriteFile("qa_data/tokens/qb-access-token.json","utf-8",$false)

$("OAuth2 token refreshed!")
$("New Access Token = " + $oauth2.AccessToken)