(Tcl) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 or greater.)

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load ./chilkat.dll

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

# The previously fetched eBay access token looks like this:

# {
#   "access_token": "v^1.1#i^1# ... HwSAAA=",
#   "expires_in": 7200,
#   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
#   "refresh_token_expires_in": 47304000,
#   "token_type": "User Access Token"
# }

set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/tokens/ebay-access-token.json"]
if {$success == 0} then {
    puts "Failed to load the existing ebay access token JSON."
    delete_CkJsonObject $json
    exit
}

set oauth2 [new_CkOAuth2]

CkOAuth2_put_TokenEndpoint $oauth2 "https://api.sandbox.ebay.com/identity/v1/oauth2/token"

# Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "EBAY_CLIENT_ID"
CkOAuth2_put_ClientSecret $oauth2 "EBAY_CLIENT_SECRET"

# Get the "refresh_token"
CkOAuth2_put_RefreshToken $oauth2 [CkJsonObject_stringOf $json "refresh_token"]

# Send the HTTP POST to refresh the access token..
set success [CkOAuth2_RefreshAccessToken $oauth2]
if {$success != 1} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkJsonObject $json
    delete_CkOAuth2 $oauth2
    exit
}

# Load the access token response into the JSON object 
CkJsonObject_Load $json [CkOAuth2_accessTokenResponse $oauth2]

# 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.
CkJsonObject_put_EmitCompact $json 0
CkJsonObject_WriteFile $json "qa_data/tokens/ebay-access-token.json"

puts "OAuth2 authorization granted!"
puts "New Access Token = [CkOAuth2_accessToken $oauth2]"

delete_CkJsonObject $json
delete_CkOAuth2 $oauth2