OAuth 2.0 Authorization Code flow grant type - PQ API Connection

[Marco_Iac]

Hi, i'm tryng to to get Access Token from an OAuth2 Authorization Code flow.

Here the code: "PART 1" work fine and return the Authorization Code, bat "PART 2" don't work and return error.

Thanks for help

let

// PART 1: Get Authorization Code
Body = 
"{
""username"":""<MyUsername>"",
""password"":""<MyPsw>"",
""scope"":[""<SelectedScope>""]
}",

url = "http://XXXXXXXXXXXXXXXXXXXXXXXXXXX/api/login/sso",
GetJson = Json.Document(Web.Contents(url, [Headers=[ContentType="application/json"], Content=Text.ToBinary(Body)])),
AuthorizationCode = GetJson,

// The previous code correctly returns the Authorization Code

// PART 2: Now I try to Get Access Token passing the Authorization Code, the client_id and the client_secret

// Base64 Encoding
a = "<client_id>" & ":" & "<client_secret>",
a2 = Text.ToBinary(a),
a3 = Binary.ToText(a2, BinaryEncoding.Base64),

TokenURL = "http://XXXXXXXXXXXXXXXXXXXXXXXXXXX/oauth2/token/",
Body2 = 
"{
""grant_type"": ""authorization_code"",
""code"": """&AuthorizationCode&""" 
}",

Source = Web.Contents(TokenURL, [Headers = [ContentType="application/json", Authorization = "Basic "&a3&""], Content = Text.ToBinary(Body2)])

in Source

[Marco_Iac · Accepted solution]

Solved, the problem was due to an erroneous Base64 Encoding

[v-yingjl]

Hi @Marco_Iac ,

What did the error message show in power query about part2, did it show the authentication error or anything else?

Could you please consider sharing more details about this issue so that members in the community could help you better.

Best Regards,
Community Support Team _ Yingjie Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.