[TENNIS] Variable total global back for tennis1 and tennis2

what is the variable for the global market number back for tennis1/2? I was studying possible inputs for number of backs and not for volume (which could be distorted by the inputs in the cover of the bookmakers)

Do you mean the amount of money offered on the back side?

I try to explain myself better

if I look at the volume, just one place 20k is enough to change the trend (I'm talking about trading), if I look I look at the number of entries that have been made (13, 19 ... 2400) it makes me understand exactly what the will of the trader. 100 entrances from € 1 are worth more than a single entry of 100k

No, this information is not available in the BetFair API.

No, this information is not available in the BetFair API.

Thx for reply
how could I then take the flow to understand what they are entering?

You could trace big volume changes by checking the voldif_{minutes} variable.

Voldif Is Total or only back of lay for single selection?

voldif returns the amount matched on the given selection over the specified number of minutes.

Matched amounts do not belong to either back or lay.