Fix recording balancetransaction details (eg. available_on) on FinancialTrxn when payment is completed immediately (eg. Contribution page) and add tests to cover this scenario

Retrieve available_on and exchange_rate from balancetransaction and save to customdata during charge.succeeded IPN

Add StripeCustomer.getFromStripe and StripeCustomer.updateStripe API4 actions to get/set stripe customer metadata

Allow to configure a minimum amount that Stripe can process. Anything below this will fail with 'Bad Request'. This helps reduce card testing in some circumstances