I am integrating blocktrail api in my web application and i am new to bitcoin. I created new account in blocktrail,and created new wallet.And it is 0.00000000 tBTC now. Will you please tell me how to make payment using this blocktrail? I foud the code in https://www.blocktrail.com/api/docs/lang/php#receiving_transactions.But How to transfer bitcoin to our merchant account from client?

-error is coming "Uncaught exception strong text'Blocktrail\SDK\Connection\Exceptions\EndpointSpecificError' with message 'Wallet balance too low'";