Send Payjoin with fee_rate parameter

Author: DanGould

src/bitcoin/payment.rs

@@ -64,8 +64,14 @@ pub async fn create_payjoin(
     let original_psbt = sign_original_psbt(wallet, psbt).await?;
     info!("Original PSBT successfully signed");
 
-    // TODO use fee_rate
-    let pj_params = payjoin::send::Configuration::non_incentivizing();
+    let pj_params = match fee_rate {
+        Some(fee_rate) => {
+            payjoin::send::Configuration::with_fee_contribution(bitcoin::Amount::ZERO, 0)
+                .min_fee_rate_sat_per_vb(fee_rate.as_sat_per_vb())
+        }
+        None => payjoin::send::Configuration::non_incentivizing(),
+    };
+
     let (req, ctx) = pj_uri.create_pj_request(original_psbt.clone(), pj_params)?;
     info!("Built PayJoin request");
     let response = reqwest::Client::new()