Try ending lines 2 and 3 with a comma so the JCL reader knows that these lines are not yet complete (ie. continue on the following line).
//PAYMENT JOB MSGCLASS=H
//PAYMENT EXEC PGM=PAYMENT,REGION=1024K, <== continued...
// PARM='CSQ1,CARD.PAYMENTS,IND0163.REPLY,IND0163, <== continued...
// 5999.99,"MY PAYMENT"'
//STEPLIB DD DSN=ZOS.CONTEST3.PART2.LOAD,DISP=SHR
// DD DSN=WMQ.V6R0.SCSQLOAD,DISP=SHR
// DD DSN=WMQ.V6R0.SCSQANLE,DISP=SHR
// DD DSN=WMQ.V6R0.SCSQAUTH,DISP=SHR
//STDOUT DD SYSOUT=*
//STDERR DD SYSOUT=*
//SYSPRINT DD SYSOUT=*