We need developer to work online with our team and do the customization directly task by task. For exist application developed on flutter and Laravel application and we need the following changes:
1- Replace the current theme with new one already we have the designs.
2- Add a page after splash screen with our logo and call the list of exist languages buttons - It show only at first time the user open the application, if logout then it will show again.
3- Add the Payment gateway we have an API code for that ready to use provided by the gateway team with keys. Note that PayPal and strip already there but we need another one.
We have a very limited budget and time, requirements are clear above please provide clear estimation of time and budget so we don't discuss it further and waste each other time.