Hi Santosh,
I am currently working on a similar kind of project where in we have to use jobs for Postal Validation and I am struggling to understand the same. I am currently trying to understand the working of the address cleanse.
Regarding to your question about postcode and ( postcode + street) options, when you provide both street and postcode, the priority of the assignment goes to Street over postal code. Hence there is an option which you need to manually set within Options tab which says " Post code over street" which is defaulted to NO needs to be set as YES, which would allow you to set priorities on postal code rather than on street. By Default, when you will look for suggestions based on address, it is defaulted to prioritize street over postal code.
Also there is parsing being done on the address when you reference the multiline addresses in Input In Address Cleanse Transform. i.e. if the whole of the address is inputted in one line, one could parse each of the sections and accordingly throw suggestions to you.
Hope have answered your query. I am also working on the same so would be happy to connect if you have any other question.
Thanks
AJ