Underpaid Invoice [on hold]

I happened to pay a little less bitcoins than needed for my transaction (i didnt counted the currency difference) and the merchant said it was possible to either send me less of what i am buying or he can refund my transaction. Since then I received no answer and now i am waiting more than 24h for response. I have all the detail needed, I just want either what i bought or a refund. What is you opinion ? What should I do ? I received nothing , my bitcoins are gone 🙁 Any ideas / help

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Create an invoice and one time use bitcoin wallet

I am looking for transaction code that will have multiple output, including an opreturn that I can send to a customer as an invoice who signs the transaction.

In other words, I want to create a transaction using their account for input and they need to use their signature. Once paid, do a sendmany transaction of differing amounts to as many as 5 recipient addresses. I have not yet tried anything because all documentation assumes that I want the bitcoin to come to my bitcoin wallet, which I do not. Can anybody advise me on how to do this? Thanks!

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