Workflow payload is the data passed during the novu.trigger method. This is useful for ensuring that the payload is correctly formatted and that the data is valid.

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Payload Schema

Payload schema is defining the payload passed during the novu.trigger method. This is useful for ensuring that the payload is correctly formatted and that the data is valid. 
workflow('comment-on-post', async ({ step, payload }) => {
    await step.email(
      'send-email',
      async () => {
          return {
            subject: `You have a new comment from: ${payload.author_name}.`,
            body: render(<ReactEmailContent comment={payload.comment} />),
        }
      });
  },
  {
    payloadSchema: {
            // Always `object`
          type: 'object',
          // Specify the properties to validate. Supports deep nesting.
          properties: {
            post_id: { type: 'number' },
            author_name: { type: 'string' },
            comment: { type: 'string', maxLength: 200 },
          },
          // Specify the array of which properties are required.
          required: ['post_id', 'comment'],
          // Used to enforce full type strictness, with no rogue properties.
          additionalProperties: false,
		      // The `as const` is important to let Typescript know that this
		      // type won't change, enabling strong typing on `inputs` via type
		      // inference of the provided JSON Schema.
        } as const,
  },
);

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Passing Payload

Here is an example of the validated payload during trigger: 
novu.trigger('comment-on-post', {
    to: 'subscriber_id',
    payload: {
        post_id: 1234,
        author_name: 'John Doe',
        comment: 'Looks good!'
    }
});