how the seller can know when the buyer has bought his goods

gapper

Member
Hi,

some weeks ago I asked for a way to know when the buyer buys the seller items. I did the example with Tom and Jerry: Tom sells cheese to Jerry and he would want to know when Jerry buys the cheese from Tom.
The answer had two ways to do that: upsert plugin use and a procedure with database join elements system.
I didn't save the procedure, so please could you explain again the procedure to let Tom knows when Jerry is buying?
 
We are in need of some funding.
More details.

Thank you.

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