title: Wallet for digital goods : TVA and subscription frequency
body: <p>I use the wallet for digital goods for three month on production but some annoying behaviour are puzzling me.</p>
  
  <p>First of all, taxes are taken into account for the "initialPayment" but not for the "recurrence" one. This is very anoying since I don't have API to let the server now what clients do actualy pay.</p>
  
  <p>Secondly, it seems that the monthly frequency is 30 days regardless of the month. This is also very annoying since the billing date in the month shifts gradually.</p>
  
  <p>Is it possible I missed something in the configuration of the JWT to have that kind of behavior ?</p>
  
  <p>Thx</p>