You just need to store values in database.

For example in such table:
product | price | count | ad group id | keyword id | date.

Every time when your script will get new merchant feed it should
compare current price and database value.
If they differs you just need to update parameters in Adwords and your
database.
If some products is missing in feed they should be stoped.

As the result you need to build script which will be able
to create new keywords and parameters and update-delete (based on your
logic) old automatically.

Regards,

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