Exchange authorization_code for access_token

[ol1s]

Please excuse my ignorance here but I'm trying to use the oauth2 scheme with authorization_code grant.

I have nuxt-auth configured as follows:

auth: {
  strategies: {
    oauth: {
      scheme: "oauth2",
      grantType: "authorization_code",
      responseType: "code",
      clientId: "1",
      endpoints: {
        authorization: "https://example.com/oauth/authorize",
        token: "https://example.com/oauth/token",
      },
    },
  },
},

Then I call the following and it redirects successfully to my authorize server, which in turn responds with a code to my app:

this.$auth.loginWith('oauth')

But the question is how do I then exchange this code for an access_token with my auth server?