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If you are looking to import multiple coupons into our payment tools, I'm afraid that this is not possible at the moment. Coupons for the payment tool can only be created manually, as explained in this guide:
The only way to implement automatic and unique different coupon codes, which would still have to follow a certain pattern, would be to use multiple regular form fields, calculation widgets, and possibly a Unique ID widget - instead of the coupon feature of the payment tool.
We would need to use multiple regular fields to describe and select your products, Unique ID widget to create the coupon or a part of the coupon, Conditions to check if this coupon matches the one that user has provided, and than use form calculation to calculate the total price. We would then pass the calculated price to the payment tool for processing.
While more flexible, it is a little more complex to set up compared to using the payment tool itself. We would need to re-create all products in regular fields instead of the payment tools, and then perform custom calculations any way we want.
I hope this helps. If you want to try using regular fields and calculations/conditions, and you hit any snags along the way, please let us know and we will be happy to help.