they could keep one for themselves if they soldered the three of them for me.
According to this post, the payment was arranged to be if the soldering job was done. The post then goes on to say that not only did he not solder the parts, he damaged them so they cannot be soldered by anyone else.
The other person did not fulfill his part of the agreement, so he has no right to the compensation.
I haven't found a way to do so, natively but have seen a few people claiming that some Kbin phone apps will let you do so through the app itself.
Can't remember which ones though, as I am primarily a desktop user.