payment terms

hi all

how to config payment terms as there is no point of discount in such kind a payment terms....my client has given me around 130 payment terms like ths only....

1 DIRECT WITH IN 30 DAYS OF GR DATE.

&2 DIRECT WITH IN 7 DAYS OF RECPT OF MTRLS.

&3 DIRECT WITHIN 15 DAYS OF RECPT OF MTRLS

SAP MM