Hello ASM,
I hope you are well and thank you for contacting us.
You can use the following link to get documentation for the Make a Price Offer for WooCommerce plugin:
https://wpfactory.com/docs/price-offers-for-woocommerce/
You can also benefit from the information in this link:
https://wpfactory.com/item/price-offers-for-woocommerce/
As for your question about the differences between the mentioned status offers, let me explain them to you:
“Complete” and “cancel” are used to classify your offers so that you, as a website owner, know whether this offer is complete or cancelled.
“Reject” & “Accept” are used to temporarily inform the client that the offer he applied is rejected or accepted. When you choose any of these options, an automatic email appears to be sent to the client to inform him of his offer status, as shown in the screenshot attached to you. Screenshots
You can also modify this email as you like.
I hope this is useful and clear to you.
Thanks and best regards.