Добавление сделки с выбором реквизитов существующей компании или контакта

Пример размещения на странице сайта формы, после заполнения которой в Битрикс24 создавётся новая сделка с прикреплением компании с реквизитами.

1. Создайте форму на нужной странице:

   <?
   $arAddressFields = CRest::call('crm.address.fields',[]);
   /*
   crm.address.fields return:  https://dev.1c-bitrix.ru/rest_help/crm/requisite/requisite_fields.php#address
   */
   $arRequisiteType = CRest::call('crm.requisite.preset.list',
   	[
   		'select'=>[
   			"ID", "NAME"
   		]
   	]
   );
   if(!empty($arRequisiteType['result'])):
   	$arRequisiteType = array_column($arRequisiteType['result'],'NAME','ID');
   	//unset system address fields
   	unset($arAddressFields['result']['TYPE_ID']);
   	unset($arAddressFields['result']['ENTITY_TYPE_ID']);
   	unset($arAddressFields['result']['ENTITY_ID']);
   	//unset uninteresting address fields
   	unset($arAddressFields['result']['COUNTRY_CODE']);
   	unset($arAddressFields['result']['ANCHOR_TYPE_ID']);
   	unset($arAddressFields['result']['ANCHOR_ID']);
   	?>
   	<form id="form_to_crm">
   		<select name="REQ_TYPE" required>
   			<option value="" disabled selected>Select</option>
   			<?foreach($arRequisiteType as $id=>$name):?>
   				<option value="<?=$id?>"><?=$name?></option>
   			<?endforeach;?>
   		</select>
   		<input type="text" name="TITLE" placeholder="Org name" required>
   		<input type="text" name="INN" placeholder="INN">
   		<input type="text" name="PHONE" placeholder="Phone">
   		<?if(is_array($arAddressFields['result'])):?>
   			<?foreach($arAddressFields['result'] as $key=>$arField):?>
   				<input type="text" name="ADDRESS[<?=$key?>]" placeholder="<?=$arField['title']?>" <?=($arField['isRequired'])?'required':'';?>>
   			<?endforeach;?>
   		<?endif;?>
   		<input type="submit" value="Submit">
   	</form>
   <?else:?>
   	No requisite types.
   <?endif;?>
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
   <script>
   $(document).ready(function() {
   	$('#form_to_crm').on( 'submit', function(el) {//event submit form
   		el.preventDefault();//the default action of the event will not be triggered
   		var formData = $(this).serialize();
   		$.ajax({
   			'method': 'POST',
   			'dataType': 'json',
   			'url': 'form.php',
   			'data':  formData,
   			success: function(data){//success callback
   				alert(data.message);
   			}
   		});
   	});
   });
   </script>

2. Создайте файл form.php для сохранения заполненных форм:

   <?
   $iRequisitePresetID = intVal($_POST["REQ_TYPE"]);
   $sTitle = htmlspecialchars($_POST["TITLE"]);
   $sINN = htmlspecialchars($_POST["INN"]);
   $sPhone = htmlspecialchars($_POST["PHONE"]);
   $arAddress = [];
   
   foreach($_POST["ADDRESS"] as $key=>$val){
   	$arAddress[$key] = htmlspecialchars($val);
   }
   $arAddress['TYPE_ID'] = 1;//1 is actual address in CRest::call('crm.enum.addresstype');
   $arAddress['ENTITY_TYPE_ID'] = 8;//8 - is requisite in CRest::call('crm.enum.ownertype');
   
   $arPhone = (!empty($sPhone)) ? array(array('VALUE' => $sPhone, 'VALUE_TYPE' => 'WORK')) : array();
   
   $result = CRest::call(
   	'crm.company.add',
   	[
   		'fields' =>[
   			'TITLE' => $sTitle,
   			'COMPANY_TYPE' => 'CUSTOMER',//is Client in CRest::call('crm.status.list',['filter'=>['ENTITY_ID'=>'COMPANY_TYPE']])
   			'PHONE' => $arPhone,
   		]
   	]
   );
   if(!empty($result['result'])){
   	$resultRequisite = CRest::call(
   		'crm.requisite.add',
   		[
   			'fields' =>[
   				'ENTITY_TYPE_ID' => 4,//4 - is company in CRest::call('crm.enum.ownertype');
   				'ENTITY_ID' => $result['result'],//company id
   				'PRESET_ID' => $iRequisitePresetID,
   				'TITLE' => $sTitle,
   				'ACTIVE' => 'Y',
   				'NAME' => $sTitle,
   				'RQ_INN' => $sINN,
   			]
   		]
   	);
   	$arDealFields = [
   		'TITLE' => $sTitle,
   		'COMPANY_ID' => $result['result']
   	];
   	if(!empty($resultRequisite['result'])){
   		$arDealFields['REQUISITE_ID'] = $resultRequisite['result'];//add requisite to deal is analogue "crm.requisite.link.list"
   		$arAddress['ENTITY_ID'] = $resultRequisite['result'];//id requisite
   		$resultAddress = CRest::call(
   			'crm.address.add',
   			[
   				'fields' =>$arAddress
   			]
   		);
   	}
   	$resultDeal = CRest::call(
   		'crm.deal.add',
   		[
   			'fields' => $arDealFields
   		]
   	);
   	echo json_encode(['message' => 'add']);
   }elseif(!empty($result['error_description'])){
   	echo json_encode(['message' => 'not added: '.$result['error_description']]);
   }else{
   	echo json_encode(['message' => 'not added']);
   }?>