Sumproduct basics

I am sorry to post again in another thread, I'm still getting used to the forum!

I had a question about SUMIF, SUMIFS and SUMPRODUCT.
Well, I could manage to work with SUMIFS, but now I have an urgent need to adapt it to OO, so I need SUMPRODUCT.

I attached an Example of my DataSheet. It has SALES and the BREAKDOWN, where I basically put together a daily report!

As you can see, on the BREAKDOWN Sheet I want to SUMIF the values of the SALES, but under the FORM OF PAYMENT criteria. I can do it easily with SUIMIF, but when I go to the next day e.g. 10/10/10 I have to use SUMIF again and manually declare the range of rows I want to include in the formula, and that really sux! I want to say WHEN ANY cells from the Column A from SALES matches the value of A2 (05/05/05 in the example), then SUMIF(RANGE 1;"CREDIT";RANGE 2), the regular SUMIF! This first condition is killing me! Can anyone help?

Thank you!

Wow you guys are great! This helped me SO much! I'd pay you the 10 rounds of drinks if I had the chance! Thank you both very very much!