How can I create an issue with desired issue key using api

[Aggarwal_ Kushal]

I am trying to create a issue with desired issue key(that is not already present) and not with next counter issue key. 

Please provide me a solution along with reference document for support

[Radek Dostál]

You can't, issue keys are automatically generated. The only way you can touch the number is by fiddling with the DB, which is for obvious reasons unsupported and you could break stuff by doing it.