[TASK] Set polling limit for payment status poll
[TASK] Create custom isValid method on payment create model
[TASK] Validate null form fields on submit
[FEATURE] Log in to specific gatewayd host url
[TASK] Handle form validation on login form
[TASK] Add appConfig for setting up initial app constants
[TASK] Create fetchRippleTransactions dispatch action
[TASK] Continuously fetch ripple transactions from database