[v4] Create ACH Transfer

[thedev132]

Summary of the problem

Send ACH Transfer via mobile would be cool

Describe your changes

/api/v4/ach_transfers POST would create a new ACH transfer. Most logic was copied from the web controller.

hcb/app/controllers/ach_transfers_controller.rb

Lines 49 to 71 in 4d7634e

	def create
	@ach_transfer = @event.ach_transfers.build(ach_transfer_params.except(:file).merge(creator: current_user))
	authorize @ach_transfer
	if @ach_transfer.amount > SudoModeHandler::THRESHOLD_CENTS
	return unless enforce_sudo_mode # rubocop:disable Style/SoleNestedConditional
	end
	if @ach_transfer.save
	if ach_transfer_params[:file]
	::ReceiptService::Create.new(
	uploader: current_user,
	attachments: ach_transfer_params[:file],
	upload_method: :transfer_create_page,
	receiptable: @ach_transfer.local_hcb_code
	).run!
	end
	redirect_to event_transfers_path(@event), flash: { success: "ACH transfer successfully submitted." }
	else
	render :new, status: :unprocessable_entity
	end
	end

[Luke-Oldenburg]

lgtm!