What levels of wheelchair tournaments are there?

The ITF's UNIQLO Wheelchair Tennis Tour is graded by ranking points:

• Junior events are graded Masters, Grade A and Junior Series.
• National associations or other organisers run individual tournaments, which the ITF sanctions onto the Tour.
• The national team competition is the BNP Paribas World Team Cup, and the season ends with the Masters (NEC Wheelchair Tennis Masters for singles, UNIQLO Doubles Masters, and the Junior Masters).
• Before you can enter any of these you must register each year for an ITF IPIN and pay the fee (with parental consent if you're a minor).