do check for company_email on server side to avoid Stripe error missing email on invoice #remoteok new job post

let future staff #remoteok generate job post bundles without paying for them for customers, so they can invoice it via Stripe

add &job_id= to Stripe Checkout callback #remoteok so we can find the job even if the stripe_checkout_session_id is mismatching, in that case we can check the payment in the callbacked stripe_checkout_session_id, and still post the job

add bunch of Stripe stuff #autorepurposeai