PHP 8 order parameter fix and the arrival_date payout option is removed

[asanovr]

1. The $amount parameter for reverse transfer can be null by default and is not required PHP8 deprecating warning #10
2. The arrival_date parameter is not needed to create a payout https://stripe.com/docs/api/payouts/create
3. Missing brace is fixed

[asanovr]

@ExpDev07

[MariusSpring]

Hey! Wouldn't this be a breaking change? To insert a new parameter between other params? @asanovr

[asanovr]

@MariusTechweb Hi!, Yeah! I removed only one argument in the payoutStripeAccount method, it doesn't work anyway, I tested it a few weeks ago

[oleg-kolzhanov]

Hey! Wouldn't this be a breaking change? To insert a new parameter between other params? @asanovr

Agree.