Merge two payload messages based on same value in both payloads

[dynamicdave]

Have a look at this thread about merging messages...

Merging Values to a single payload

It is unclear to me what your problem is since you don't explain what the sources of the data are (what nodes they are), how you inject 'inject' the data. Please create a small flow demonstrating your problem and post it to a reply. In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```) ``` code goes here ``` You can edit and correct your post by clicking the pencil icon. See this post…

Might be worth taking a look at this CookBook article as well...
https://cookbook.nodered.org/basic/join-streams

EDIT:
The above method relies on the input messages to be merged having DIFFERENT topic-names.
It is unclear what the topic-name is for your two sets of incoming data and whether a unique topic-name could be applied (at the source where the data is created).