B4X

MercadoLibre Refresh OAuth2 Access Token

See more MercadoLibre Examples

Demonstrates how to refresh a MercadoLibre OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example. B4X

Dim success As Boolean = False

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

'  It is assumed we previously obtained an OAuth2 access token.
'  This example loads the JSON access token file 
'  saved by this example: Get MercadoLibre OAuth2 Access Token

Dim jsonToken As ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/mercadolibre.json")
If success <> True Then
    Log("Failed to load mercadolibre.json")
    Return
End If


'  The access token JSON looks like this:

'  {
'    "access_token": "APP_USR-8133606632685744-060115-93e1fd8b5e767c51c238df347bd0b288-577628017",
'    "token_type": "bearer",
'    "expires_in": 21600,
'    "scope": "offline_access read write",
'    "user_id": 577625107,
'    "refresh_token": "TG-5ad522a286f1200006ac4ed1-577625007"
'  }

Dim oauth2 As ChilkatOAuth2
oauth2.Initialize("oauth2")

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

'  Replace these with actual values.
oauth2.ClientId = "MY_MERCADOLIBRE_APP_ID"
oauth2.ClientSecret = "MY_MERCADOLIBRE_APP_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 <> True Then
    Log(oauth2.LastErrorText)
    Return
End If


Log("New access token: " & oauth2.AccessToken)
Log("New refresh token: " & oauth2.RefreshToken)

'  Update the JSON with the new tokens.
jsonToken.UpdateString("access_token", oauth2.AccessToken)
jsonToken.UpdateString("refresh_token", oauth2.RefreshToken)

'  Save the new JSON access token response to a file.
Dim sbJson As ChilkatStringBuilder
sbJson.Initialize
jsonToken.EmitCompact = False
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/mercadolibre.json", "utf-8", False)

Log("OAuth2 authorization granted!")
Log("New Access Token = " & oauth2.AccessToken)