Support for 'redirect' login style

[techbos]

Packages used:

bozhao:link-accounts
zhaoyao91:accounts-wechat-mp
zhaoyao91:short-oauth-state

Wechat-MP (公众号) uses 'redirect' login style. When linking, it always creates a new account instead of linking to the existing user. Any thoughts?

Here is how I call link:

linkWithWechatMP({ Meteor }, options, callback) {
    if (!Meteor.userId()) {
      throw new Meteor.Error(402, 'Please login to an existing account before link.');
    }
    if (!Package[ 'zhaoyao91:accounts-wechat-mp' ]) {
      throw new Meteor.Error(403, 'Please include zhaoyao91:accounts-wechat package')
    }
    if (!callback && typeof options === "function") {
      callback = options;
      options = null;
    }
    var credentialRequestCompleteCallback = Accounts.oauth.linkCredentialRequestCompleteHandler(callback);
    WeChatMP.requestCredential(options, credentialRequestCompleteCallback);
  },

[StorytellerCZ]

Duplicate of #58

[StorytellerCZ]

@techbos As for the code it looks as any other, so I don't think the problem is there.