code: func (a *AccountService) Get(accountURL string) (acme.Account, error) {
  	if len(accountURL) == 0 {
  		return acme.Account{}, errors.New("account[get]: empty URL")
  	}
  
  	var account acme.Account
  	_, err := a.core.post(accountURL, acme.Account{}, &account)
  	if err != nil {
  		return acme.Account{}, err
  	}
  	return account, nil
  }
docs: // Get Retrieves an account.