Hi John,
The message you receive when reaching a new level is not about a reward (unfortunately) but about new clubs unlocked. Depending on your level, you'll see that you don't have access to all the equipment in the proshop. But as you move from level to level, you'll unlock new clubs and will, eventually, have access to all of them.
The only reward system is based on tiers move, not levels, as the FAQ section states here:
Amateur: 50 credits
Pro: 100 credits
Tour Pro: 150 credits
Master: 200 credits
Tour Master: 400 credits
Legend: 800 credits
Happy hittin'
Rob