OAuth provider token error in v5

[asifkabani]

Hello I have setup a custom provider for OAuth specifically Clover. I am migrating to v5 and in the token request I have to set the headers to Content-Type: application/json as the provider is not following standard OAuth specs.

When I make the request, I am getting an error:

error {
  timestamp: 1720036150947,
  status: 415,
  error: 'Unsupported Media Type',
  message: "Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported",
  path: '/auth-token/oauth/v2/token'
}

Here is my token config:

token: {
        url: tokenUrl,
        async request({ params: { code } }: any) {
          const tokens = await makePostRequest(oauthConfig.tokenUrl, {
            client_id: oauthConfig.clientId,
            client_secret: oauthConfig.clientSecret,
            code,
          });
          return { tokens };
        },
      },

And here is the function for reference:

export async function makePostRequest(
  url: string,
  body: { [key: string]: string | any },
): Promise<TokenSet> {
  try {
    const response = await fetch(url, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify(body),
    });

    if (!response.ok) {
      throw new Error(`Token request failed with status ${response.status}`);
    }

    const tokens: TokenSet = await response.json();
    return tokens;
  } catch (error) {
    console.error("Token Request Failed");
    throw error;
  }
}