Integrating unity ads in Python Kivy

Has anyone published a guide in how to integrate Unity's SDK in Python Kivy? (is it even possible?) I'm trying to do this through Pyjnius, but as I have no familiarity with java, this is naturally very hard. (I am planning to learn it soon to make life easier). This is what I've managed so far:

 from jnius import autoclass, PythonJavaClass, java_method
 from kivy.app import App
 import logging
 
 PythonActivity = autoclass("org.kivy.android.PythonActivity")
 Unity_ads_listener = autoclass("com.unity3d.ads.IUnityAdsListener")
 Unity_ads = autoclass("com.unity3d.ads.UnityAds")
 
 
 class Unity_handler:
  
    def __init__(self,application_id,test_m):
       self.app_id = application_id
       self.test_mode = test_m
 
    def init_unity(self):
      
      new_ad_listener = Unity_ads_init()
      Unity_ads.addListener(new_ad_listener)
      Unity_ads.initialize(self,self.app_id,testmode)
 
    def show_ad(self, id_num):
    
      #show interstial ads
      self.inter_id = id_num
      if Unity_ads.isReady(self.inter_id):
           Unity_ads.show(self, self.inter_id)
 
 
 #####################################################################################################################################
 
 class Unity_ads_init(PythonJavaClass):
     __javainterfaces__= ['com/unity3d/ads/IUnityAdsListener']  
 
     def __init__(self):
                 super(Unity_ads_init, self).__init__()
                 #self.callback = callback
 
     @java_method('Ljava/lang/String;')
     def onUnityAdsReady(self, inter_id):
        pass        
 
     @java_method('Ljava/lang/String;')   
     def onUnityAdsStart(self, inter_id):
        pass
 
     @java_method('Ljava/lang/String;(Ljava/lang/String;)')
     def onUnityAdsFinish(self, inter_id,un_f):
        pass
 
     @java_method('(Ljava/lang/String;)Ljava/lang/String;')
     def onUnityAdsError(self, error, message):
        pass
     

Any help with this would be appreciated. I feel like a total noobstick, Atm I'm getting "jnius.jnius.JavaException: JVM exception occurred: interface com.unity3d.ads.IUnityAdsListener is not visible from class loader"