federated tables? synchronization? replication? [mysql]

I have a REMOTE suppliers table with, lets say, a code and a name, and several client databases will be creating new suppliers.

Server database

code  |  name
______________
1     |  Mark
2     |  John
3     |  Jodie

I thought that a federated table would fit the best, as every client could create new suppliers in a centralized table which assigns incremental codes,

Obviously, if the Internet connection is down, clients won't be able to create new suppliers, so this won't work for me.

I thought that the best idea would be assigning a prefix to each client, and the code count would be assigned locally.

Local table client A

code  |  name
______________
A1     |  Mark
A2     |  Jodie

Local table client B

code  |  name
______________
B1     |  John

Then, the data would be merged into a single remote table.

Remote merged table

code  |  name
______________
A1     |  Mark
B1     |  John
A2     |  Jodie

But at this point, I am lost, I don't know if there is a solution for this problem, or I would need to merge them with a cron job + script.

Maybe a multiple-masters-to-1-slave would work?

Is there any way to schedule merge jobs?

Any idea would be appreciated.