Before posts about Hydra get access token is use golang HydraOauthConfig.Exchange(ctx, code). This is easy way. But on front website like vue or other framework how to get access token.

Use REST Client to test

  
POST https://openid.hydra:9001/oauth2/token  
Authorization: Basic YXV0aC1jb2RlLWNsaWVudDpzZWNyZXQ=  
Content-Type: application/x-www-form-urlencoded  
  
grant_type=authorization_code  
&code=cuNw76aEuckIJJyVssk2LJvqdLXffT-8Kx1s0tYFt6Y.v0Dxc2_yT9ga8c2moKx0fDbwRFVgwryAt5BJM7lOJlM  
#&redirect_uri=https://certfront/oid/test/callback  
#&scope=openid,offline  
#&client_id=auth-code-client  
#&code_verifier=  
#&state=gczxkznmjkrksgytsemvwgkf

Import is： Authorization: Basic

https://github.com/ory/hydra/issues/631

Not Authorization: Bearer

base64(urlencode(client_id):urlencode(client_secret))

YXV0aC1jb2RlLWNsaWVudDpzZWNyZXQ= => auth-code-client:secret

example: https://t.tt:9010/callback?code=cuNw76aEuckIJJyVssk2LJvqdLXffT-8Kx1s0tYFt6Y.v0Dxc2_yT9ga8c2moKx0fDbwRFVgwryAt5BJM7lOJlM&scope=openid%20offline&state=gczxkznmjkrksgytsemvwgkf

If code have error message, you need check before any step have incorrect.

In Ory Hydra get access token is not like sdk document

https://www.ory.sh/docs/hydra/sdk/api#the-oauth-20-token-endpoint

You need to sure grant_type=authorization_code Not other options.

But SDK Document No any options example. Only suggestion you use lib. So you need to try many.

like follow
https://www.oauth.com/oauth2-servers/pkce/authorization-code-exchange/
https://community.ory.sh/t/how-configure-grant-implicit-flow/411/14
https://auth0.com/docs/api-auth/tutorials/authorization-code-grant-pkce
https://github.com/oauthjs/express-oauth-server/issues/55
https://www.jianshu.com/p/5cf2b7a45b75
http://www.passportjs.org/docs/oauth/

Then try out a ways.

OK. Mark is not important Required.

  
#&redirect_uri=https://certfront/oid/test/callback  
#&scope=openid,offline  
#&client_id=auth-code-client  
#&code_verifier=  
#&state=gczxkznmjkrksgytsemvwgkf