Any way to earn cashback from large paynow transfer

My fiancee and I are planning for our wedding next year and instead of doing ala carte, contacting paying the venue and vendors directly, it was much cheaper with this wedding events organiser. The only downside is that payment is either paynow, cash or bank transfer so we wont be able to leverage on credit card rewards for such a big purchase (~25k venue, decor, food, etc). Does anyone perhaps know anyway that I can earn some rewards other than the googlepay paynow? As gpay is tied to your bank account also. Feels wasteful that we aren't able to get any credit rewards from such a high purchse. Any advice is appreciated. Thanks!