Question

I am integrating my extension with Plimus by batch process.
It requires Buy Anywhere API credential, but I am not able to find it anywhere.

As per their API documentation

Every API request must include authentication using the seller’s Buy
Anyware API credentials (username and password), which are different
to the seller’s Control Panel credentials.

Answer 1

I found :

The API is currently not open for all vendors. In order to be approved
for the API you should send a request to [e-mail] and the
request will be forwarded to our API team for review.

As the API requires a certain, standard, your account will be reviewed
to check for your compatibility to an API system and a reply will be
sent back to you with the results.