create quotation and contact person

Hello Experts,

I have an <removed by moderator> requirement mentioned below:

Our client will send some Quotation information along with Contact Person data from a E-commerce portal to ECC using Webservice. And then I have to:

1) Create a Contact Person for Bill To Party Customer. 
2) And when Contact Person gets created then assign this Contact Person to Bill To Party

3) create Quotation assigning this contact person.

All this processing has to be done in background mode.

Kindly provide any lead, <removed by moderator>

Thanks,

Message was edited by: Manish Kumar