Regarding link building I saw this Questions

[Name Bailey]

"Would like to ask, after you agree on a price with the webmaster, what is the usual process for paying for the guestpost?

1) Do you usually suggest/discuss a topic you want to write about?
2) Does the webmaster usually give you a guest login for you to post the article or do you send it to them to do the posting?
3) Which payment method is used? Is payment typically paid before the article is posted?
4) Do you use sites like escrow.com or how do you usually make payment to prevent play-outs?"

 

[Ezequiel]

1) This is usually mentioned as part of the outreach process.
2) 99% of the time you will just send them your content.
3) Paypal is standard, as is payment up front. Repeat customers might get some leeway on this.
4) Ideally a payment method that you can flag/charge back in case of content removal.

 

[Gerlach III]

Always make sure to pay in a payment method that you can securely dispute if something happens.

If they are not happy with PayPal fees, you can always reinburse the extra fees by adding an extra 5% on top of the total price.

This would motivate the users more.