Create a new application for a company within the authenticated organisation's subtree.

You can create an application with:

• An existing bank account by providing its UUID in relationships.bank_account.data.id
• A new inline bank account by using a local identifier (lid) in relationships.bank_account.data.lid and providing the bank account details in included[]

When using OAC tokens:

• app_public_key is optional — automatically preloaded from the OAC credentials when not provided

🔒 This endpoint requires an OAC (Organisation Access Credentials — ⚠️ Beta) access token with the applications:write scope.