Ah with your LN wallet, you can usually choose to set the amount you want to get paid by going into 'receive'. When you do this it generates a fresh 'invoice', this huge string of stuff can be sent to someone elses wallet which in turn pays the exact amount of sats which the requestee asked for. I'll see if it works here...

lnbc20n1p5jk6a9sp5707khl5cle3ssf29ntzdmqmut67nl5c76esth5umg7ewa50ujjaqpp52du6wkm2d3pcmvatavfr33cu7xj2vlqvqhufl8p6846w39lv9twshp5uwcvgs5clswpfxhm7nyfjmaeysn6us0yvjdexn9yjkv3k7zjhp2sxq9z0rgqcqpnrzjqv3dpepm8kfdxrk3sl6wzqdf49s9c0h9ljtjrek6c08r6aejlwcnurs3esqqqjgqqyqqqqqqqqqp8zqqjq9qxpqysgqttr393wr70me8e4q79k7n0ct4ncrjy8da48pdazrcsgj89wjadkklhsyshf899k09yxnkr0828jwtcxj0ezn78svd4y5t49a8fnt3gcp4za8ge

Yup working for me on jumble.social at least - all I did was paste in the string of text that starts with lnbc