Good day received a payment from a client using a home currency though we bill them using foreign currency, cant link the payment as it doesnt pick up the open invoce

A warm welcome to the Community, karanduth.

Helping you link the payment to a foreign open invoice is my priority.

To link the payment to the foreign invoice, you'll need to create a new dummy bank account in the home currency to facilitate the movement between 2 different foreign currencies since QuickBooks Online is unable to record a payment with a currency that does not match the invoice or bill's currency.

Here's how to create a dummy account:

1. Select the Gear icon, then select Chart of Accounts.
2. Select New.
3. Under Account Type column, select Cash and cash equivalent. Under Detail Type column, select Cash on hand. And under Name column, type in Dummy Bank.
4. Before saving and closing, make sure that it is in the home currency.

Once created, record the payment through the Receive Payment option and deposit the payment to the Dummy Bank. After that, you can transfer the payment from the Dummy Bank account to a foreign bank account.

Here's how:

1. Select + New.
2. Select Transfer.
3. Under Transfer Funds From column, select Dummy Bank from the drop-down arrow.
4. Under Transfer Funds To, select EUR Bank from the drop-down arrow.
5. Under the Currency column, select SGD from the drop-down arrow.
6. Under Transfer amount column, type in 1300
7. Under the Exchange rate, the exchange rate will automatically appear which is 1.625 in this case. You can manually change the rate.

You can go through this article to know more about this process: Receiving and making payment for a foreign invoice/ bill with a foreign currency.

I'll be sharing with you the following article: How Multi-currency works. This will give you more insights on what additional information that is added when you turn on this feature.

Feel free to drop me a reply below if you have any other concerns. Have a good one.