# Media Type

This documentation defines the vendor-specific media type

application/vnd.mcash.api.merchant.v1+json

We also use

application/vnd.mcash.api.merchant.v1+csv

for transaction logs, and

image/png

for attachments. In general, the form is

application/vnd.mcash.[attachment-type].[version]+[format]

Clients are expected to include media type in the Accept header listing types they understand; the Settle server responds with the media type in the Content-Type header.