In the sidebar, select Payload Schemas. The list of existing schemas opens.

On the Payload Schemas screen, select Create. The Create Payload Schema form opens.

In Client connection, select a client connection. Client connection is a required field. The schema belongs to the client connection you select.

In Name, enter a name for the schema. Use a name that is unique.

In Endpoint, enter the API path. Enter the path without a leading slash, for example create-sale-order.

In Method, select the HTTP method. Method is a required field. The options are POST, PUT, PATCH, and DELETE.

In Root type, select the root JSON structure. Root type is a required field. The options are Object and Array. Choose Object for a single JSON object, or Array for a JSON array.

Select Save. On the empty form Save is unavailable, and it becomes available after you enter values. ERP Manager creates the schema and opens its detail view. The detail view has the General and Fields tabs.

Select the Fields tab. The Payload Fields table opens.

On the Fields tab, select Create Payload Field to add a field. The Create Payload Field form opens.

In the form, enter a Name and select a Data type.

Select Save. On the empty form Save is unavailable, and it becomes available after you enter values. The new field appears in the Payload Fields table with its Name and Data Type.

Repeat the field steps until all fields are defined.