I’ve tried multiple extensions for billing, for sdk v5, I’ll recommend you to use this as it has all the blocks you need and there’s no bug, Jewel and I have tested and removed all the possible bugs : )
Demo blocks are also available there 
I’ve tried multiple extensions for billing, for sdk v5, I’ll recommend you to use this as it has all the blocks you need and there’s no bug, Jewel and I have tested and removed all the possible bugs : )
Demo blocks are also available there