Boarding a new merchant account involves a few requests in succession to build up the account into a usable state. The requests are as follows.

Requests and its usage

Url	Usage
/api/v4/merchants	To create the merchant account.
/api/v4/processors	To add a card/check processor.
/api/v4/processors	Again to add value-added services.
/api/v4/merchants	To set a fee schedule.
/api/v4/merchants	To activate the merchant and send the welcome email.

There are also a few endpoints that are useful for pulling information that you will need for these requests.

Url	Usage
/api/v4/usernames/search	Lets you see if a merchant username is available.
/api/v4/services/search	Lets you see what processors and value-added services are available to be added to merchants.
/api/v4/services/{{id}}/config	Lets you get configuration requirements for all processors.
/api/v4/fee_schedules/search	Lets you get a list of fee schedules.