In app purchases are broken – Endless Balls 3D Review

I play this game a lot. It’s been great till this week. I got stuck and needed more stars. I bought two different pa is of stars and the purchase won’t go through. The app and my phone are both up to date. And I can make in app purchases in other games as well. Can somebody help me? I have an iPhone XR.
Review by MECH 5711 on Endless Balls 3D.