Missing documentations

[crynobone]

Collection

• [x] Get Collection Index
• [x] Deactivate a Collection
• [x] Activate a Collection

Open Collection

• [x] Get an Open Collection
• [x] Get Open Collection Index

Payout Collection

• [ ] Create a Payout Collection
• [ ] Get a Payout Collection

Payout

• [ ] Create a Payout
• [ ] Get a Payout

Payment Methods

• [ ] Get Payment Method Index
• [ ] Update Payment Methods