added paypal clientid instructions
added paypal clientid instructions

yvonnewilson/docs,hamzawi06/docs,sandrinodimattia/docs,auth0/docs,jeffreylees/docs,jeffreylees/docs,Annyv2/docs,khorne3/docs,khorne3/docs,hamzawi06/docs,yvonnewilson/docs,khorne3/docs,jeffreylees/docs,Catografix/docs,Catografix/docs,auth0/docs,Catografix/docs,sandrinodimattia/docs,yvonnewilson/docs,auth0/docs,sandrinodimattia/docs,hamzawi06/docs,Annyv2/docs,Annyv2/docs,miparnisari/docs