How to Sumif between Rows that have criteria/specific text

Hi
Ive been racking my brain trying to solve an issue with an ever changing export.
I need a Sumif formula to search between two rows depending on the text in them
Excell question.PNG

Im looking to Sumif "payment method 1", but the number of rows with "payment method 1" can change from export to export.
And the starting row of "Declared payments" can change.
So ideally i want to Sum If between a range criteria set by the text: "Declared payments" & "Total Declared payments".

To complicate things more i cant just Sumif the whole sheet as i need to ignore some "payment method 1", where its not applicable.

I thought a Sumif and Vlookup, but i dont know how to make them work together?

There are instructions at the top of the page explaining how to attach your sample workbook.

This proposal employs a helper column (A) which may be moved and/or hidden for aesthetic purposes.
The helper column is populated using: =IF(B5="Declared paymemnts","Use",IF(B5="Total Declared Payments","",A4))
The Sumifs function in cell M5 is: =SUMIFS(J6:J20,A6:A20,"Use",B6:B20,"Payment Method 1")
Let us know if you have any questions.