(Chilkat2-Python) Refresh Schwab OAuth2 Access Token

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import sys
import chilkat2

success = False

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

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

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

jsonToken = chilkat2.JsonObject()
success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json")
if (success != True):
    print("Failed to load schwab-access-token.json")
    sys.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 = chilkat2.OAuth2()

oauth2.TokenEndpoint = "https://api.schwabapi.com/v1/oauth/token"

# Replace these with actual values.
oauth2.ClientId = "APP_KEY"
oauth2.ClientSecret = "APP_SECRET"
oauth2.UseBasicAuth = True

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

# Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
if (success == False):
    print(oauth2.LastErrorText)
    sys.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 = chilkat2.StringBuilder()
jsonToken.EmitCompact = False

jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",False)

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