We're unable to provide specific tax advice since everyone's situation is different. While this is by no means a guarantee, most donations on GoGetFunding are simply considered to be 'personal gifts' which are not taxed as income in most countries.
Additionally, only donations made to a legally registered non-profit or charity may be considered eligible for donors to claim as a tax deduction.
As GoGetFunding is not the owner of the campaign (the campaign owner is) it cannot issue receipts for tax deductions. Only the campaign owner can issue such receipts.
Again, every situation is different so it may be wise to consult with a tax professional in your area if you require absolute clarity.