How can I get my Merchant ID?

How can I get my merchants I'd for my jotform money transfer account 

How do I get my merchants I'd 

Are you referring to the API login ID and password for integrating Authorize.net on your form? If so, please refer to the guide below:

https://support.authorize.net/s/article/How-do-I-obtain-my-API-Login-ID-and-Transaction-Key

Let us know if you are referring something different. We will be happy to help.