code: func (c *Client) OrganizationAppCollaboratorCreate(appIdentity string, user string, options *OrganizationAppCollaboratorCreateOpts) (*OrganizationAppCollaborator, error) {
  	params := struct {
  		User   string `json:"user"`
  		Silent *bool  `json:"silent,omitempty"`
  	}{
  		User: user,
  	}
  	if options != nil {
  		params.Silent = options.Silent
  	}
  	var organizationAppCollaboratorRes OrganizationAppCollaborator
  	return &organizationAppCollaboratorRes, c.Post(&organizationAppCollaboratorRes, "/organizations/apps/"+appIdentity+"/collaborators", params)
  }
docs: // Create a new collaborator on an organization app. Use this endpoint instead
  // of the /apps/{app_id_or_name}/collaborator endpoint when you want the
  // collaborator to be granted [privileges]
  // (https://devcenter.heroku.com/articles/org-users-access#roles) according to
  // their role in the organization.
  //
  // appIdentity is the unique identifier of the OrganizationAppCollaborator's
  // App. user is the unique email address of account or unique identifier of an
  // account. options is the struct of optional parameters for this action.