Question: American rapper Fetty Wap had a feature guest appearance on a single produced by who?

Context paragraphs:
Around the World (Natalie La Rose song): "Around the World" is the second single from Dutch singer Natalie La Rose.  It features American rapper Fetty Wap, who co-wrote the song with its producers Marco "MAG" Borrero, Ilya Salmanzadeh, and Max Martin, with additional writing from Savan Kotecha, Rickard Goransson, and DJ Frank E.  The single reached number 3 on the US "Billboard" Bubbling Under Hot 100 Singles chart.

My Way (Fetty Wap song): "My Way" is the third single by American rapper Fetty Wap, featuring Remy Boyz's RGF Productions' member Monty, from Wap's self-titled debut album.  It peaked at number seven on the "Billboard" Hot 100.

Again (Fetty Wap song): "Again" is the fourth single by American rapper Fetty Wap from his self-titled debut album.  It peaked at number 33 on the "Billboard" Hot 100.

679 (song): "679" is the second single by American rapper Fetty Wap from his self-titled debut album.  The song features Remy Boyz member Monty and former Remy Boyz member P-Dice.  "679" peaked at number 4 on the US "Billboard" Hot 100, becoming his second highest-charting single after "Trap Queen".  The album version of the song omits P-Dice's verse, only featuring Monty.

Bang My Head: "Bang My Head" is a song by French DJ and music producer David Guetta, featuring vocals from Australian singer Sia and American rapper Fetty Wap.  It was released as the second single from the re-release of Guetta's sixth studio album, "Listen".  "Bang My Head" tallies as the album's seventh single overall.  It was released via digital download on 30 October 2015.  The original album version of the song only featured Sia's vocals, but the second verse was later replaced with vocals from Fetty Wap for the reworked single release.

Fetty Wap (album): Fetty Wap is the eponymous debut studio album by American rapper Fetty Wap.  It was released on September 25, 2015, by RGF Productions, distributed by Because Music and 300 Entertainment.  The album features guest appearances from Remy Boyz, Monty and M80.  Both Monty and M80, who were members of the Remy Boyz, contributed as featured guest artists on the album.

Asking 4 It: "Asking 4 It" is a song by American singer and songwriter Gwen Stefani from her third studio album, "This Is What the Truth Feels Like" (2016).  The song features guest vocals from American rapper Fetty Wap.  It was released on March 18, 2016, as the ninth track on "This Is What the Truth Feels Like" by Interscope Records.  The track was written by Stefani, Justin Tranter, Julia Michaels, Tor Hermansen, Mikkel Eriksen, and Fetty Wap.  The track's production was handled by Stargate, while additional production was made by Tim Blacksmith and Danny D.

Save Dat Money: "Save Dat Money" (stylized as $ave Dat Money), is a song by American hip hop recording artist Lil Dicky from his debut studio album "Professional Rapper".  It was released on June 10, 2015 as the album's first single.  It was produced by Money Alwayz and features guest appearances by Fetty Wap and Rich Homie Quan.  It peaked at number 71 on the "Billboard" Hot 100.

Justina Valentine: Justina Valentine is an American rapper, singer, songwriter and model from Passaic County, New Jersey, best known for her singles "Candy Land" featuring rapper Fetty Wap, "All The Way" and "Unbelievable".

Fetty Wap: Willie Maxwell II (born June 7, 1991) is an American rapper better known by his stage name Fetty Wap.  He rose to prominence after his debut single "Trap Queen", reached number two on the U.S. "Billboard" Hot 100 chart in May 2015.  This helped Fetty Wap secure a record deal with 300 Entertainment, a record label distributed by Atlantic Records.  He subsequently released two Top 10 singles in the U.S., "679" and "My Way".  Fetty Wap's eponymously titled debut album was released in September 2015 and reached number one on the U.S. "Billboard" 200 chart.

Supporting paragraphs: Save Dat Money Fetty Wap
Answer: Money Alwayz