How To Use Your Plugin To Pull Coupon Codes; How to merge Feeds

Hello,
Please how can you:
1) use your plugin to pull coupon codes into your website from shopping websites?
2) How can one merge rss feeds from different sources?
3) How to use your plugin to produce feeds from differents sources as shown below:

US assesses reported leak at Chinese (post title)
India Today 07:50        (newspaper name and time)
5 Takeaways from Vladimir Putin's (post title)
Newsweek 07:34         (newspaper name and time)
US/Russia Vladimir      (tag or category)               
Nato set to toughen G7 message on (post title)
The Irish Independent 07:06   (newspaper name and time)
NATO Not Coronavirus US   (tag or category)               
Race to vaccinate 10 million as England' (post title)
The National 08:01      (newspaper name and time)
Boris Johnson UK Coronavirus Co   (tag or category)               
Junta trial of Myanmar's Suu Kyi begins on (post title)
TRT World  07:16       (newspaper name and time)
Aung San Suu Kyi Myanmar Coup   (tag or category)