Send Mail Merge

string standalone.Test_Send_Mail_Merge(String pop_id)
{

	mail_merge_template = map();
	mail_merge_template.put("name", "POP Request Template");

	from_address = map();
	from_address.put("type", "email");
	from_address.put("value", zoho.loginuserid);

	to1 = map();
	to1.put("type", "email");
	to1.put("value", "muhammad.kaleem@leosops.com");
	
	to_address = list();
	to_address.add(to1);

	mail_merge_entry = map();
	mail_merge_entry.put("mail_merge_template", mail_merge_template);
	mail_merge_entry.put("from_address", from_address);
	mail_merge_entry.put("to_address", to_address);
	mail_merge_entry.put("subject", "POP Request Email Test");
	mail_merge_entry.put("type", "attachment");
	mail_merge_entry.put("attachment_name", "testdocument");
	mail_merge_entry.put("message", "POP Request Email Test");

	send_mail_merge = list();
	send_mail_merge.add(mail_merge_entry);

	input_payload = map();
	input_payload.put("send_mail_merge", send_mail_merge);
		SendEmail = invokeurl
	[
	url: "https://www.zohoapis.com/crm/v8/POP_Requests/"+pop_id+"/actions/send_mail_merge"
	type: POST
	parameters: input_payload.toString()
	connection:"mail_merge"
	];
	info SendEmail;

	return "";
}