Block an amount in an account

2 credits per API call.

Blocks an amount in an account. Any number of distinct amounts can be blocked in one account. Every new blockage has its own distinct ID, which is used as a reference. When the amount is blocked, it is debited from the available balance of the account. The account balance remains the same. The account balance represents the total amount of funds in the account. The available balance represents the total amount of funds that can be used to perform transactions. When an account is frozen, the available balance is set to 0 minus all blockages for the account.