I am facing a challenge. I need to check if Woocommerce Order Number will equal Post ID. I know that this is true like 90% of times, but I need bulletproof way to check this. See example where this is not true and Order number and Post ID do differ:

Things to consider:

• My plugin may be installed at a time where no orders are created in Woocommerce yet
• I found this occasion on wordpress multisite, but I know that there are also plugins for sequential order numbers. And there is a lot of them, so I cannot just check for existence of one or two plugins.
• I need to know this because I am developing a plugin to check payments made manually by the customers. So I know that the payment will be identified by Order Number and not by Order ID (which is always equal to Post ID)

Edit: Expected business flow of my plugin

The plugin I have developed is “offline payments” for bank account payment. So, the flow is this:

1. User selects products and decides to pay for them via “Bank account” payment gateway (one of default gateways in Woocommerce)
2. User will see bank account and order number to pay (In my case Order number 84)
3. User will send money to given bank account, specifying the order number (In Czech this field is called “variable symbol”)
4. The plugin connects to the bank via API and queries all transactions on given bank account
5. What I need to decide = If payment is received with order number 84, it means that Order ID 7257 (see picture above) is paid.

In most of the sites applies that Order ID == Order Number. However here not and I need to have logic how to decide this. So far I am just thinking about adding a checkbox to the plugin…

Thanks a lot for any ideas