Third-party keyboard security question

Hello everyone,

Apple says that third-party keyboard developers have access to all of the data user types. Then it says "If you enable Full Access", developers are permitted to access, collect and transmit the data you type".

So my questions are:

1. Do developers have access to the data I type with full access enabled or no?

2. If I'm using apple keyboard but third-party keyboard is installed do they still have access to the data I type?

For example: When I access to my credit card I will use apple keyboard but while I'm chat in Facebook or watsApp I use third-party keyboard. Do they(Third-party keyboard devs) have access to my credit card password?