Using paypal NVP API for PHP, you can send the initial payment to paypal like this.
$nvpstr="&AMT=10&CREDITCARDTYPE=$creditCardType&ACCT=$creditCardNumber&EXPDATE=". $padDateMonth.$expDateYear."&CVV2=$cvv2Number&FIRSTNAME=$firstName&LASTNAME=$lastName&STREET=$address1&CITY=$city&STATE=$state".
"&ZIP=$zip&COUNTRYCODE=US&CURRENCYCODE=$currencyCode&PROFILESTARTDATE=$profileStartDate&DESC=$profileDesc&BILLINGPERIOD=$billingPeriod&BILLINGFREQUENCY=$billingFrequency&TOTALBILLINGCYCLES=$totalBillingCycles&INITAMT=30.00";
$resArray=hash_call("CreateRecurringPaymentsProfile",$nvpstr);
parameter INITAMT
specifies the initial payment amount