You could use the Klaviyo API to set the order ID from your system as a custom property in the Klaviyo profile. The /identify endpoint was used for this, but the new API probably has a different endpoint for it.

Hi @dartacus ,
Thank for answer, I thinking about this. But, User can have many orderID. How to storaged all orderID to doublecheck?

Klaviyo data storage has an array type which you can use, but personally I just store people’s most recent order ID.

Also, don’t forget that the Klaviyo ‘Placed Order’ event will probably contain your order ID. Here’s an example from my own site:

It sounds like you need to check the input with your INTERNAL database, not Klaviyo’s records.  If you are trying to check with Klaviyo you can do a GetEvent call with your parameters to see if there is a record with that ID.

https://developers.klaviyo.com/en/reference/get_event

Hi @cdetdi ,

But soon after user submitted, they will receive email from Klaviyo because engage a list. How can I double check in same time to prevent if they submitted wrong code?