Criar cliente API ASAAS

createCustomer.php

<?php
	$customerData = array(
		"name" => "João da Silva", 
		"cpfCnpj" => "09434952967",
		"postalCode" => "89223005",
		"mobilePhone" => "47989134255",
		"email" => "[email protected]"
	);

	$customerParamsJson = json_encode($customerData);                                                                 
	                                                                                                                     
	$curlRequest = curl_init("https://www.asaas.com/api/v3/customers");
	curl_setopt($curlRequest, CURLOPT_CUSTOMREQUEST, "POST");
	curl_setopt($curlRequest, CURLOPT_POSTFIELDS, $customerParamsJson);
	curl_setopt($curlRequest, CURLOPT_RETURNTRANSFER, true);                                                                      
	curl_setopt($curlRequest, CURLOPT_HTTPHEADER, array(                                                                          
	    "Content-Type: application/json",                                                
		"access_token: <COLOQUE AQUI A SUA API KEY>"
	));                                                                                                                   
	                                                                                                                     
	$responseData = curl_exec($curlRequest);
	curl_close($curlRequest);

	var_dump($responseData);
?>