I received a receipt to verify payment that I need to sign. I can't seem to figure out how to insert electronic signature on this document. I'm not very familiar with Adobe Acrobat Pro.
We apologize for not getting back to your query on time.
You may refer to the help document Signing PDFs in Adobe Acrobat DC
Also, how you can create Digital ID's to sign the document electronically using Acrobat DC.
You need a digital ID to sign a document or encrypt PDFs through a certificate.
Go through the- Digital IDs in Acrobat DC
Hope this is helpful.