conversion api wrapper

package.json

@@ -62,7 +62,10 @@
 		"svelte"
 	],
 	"dependencies": {
+		"@types/facebook-nodejs-business-sdk": "^23.0.0",
 		"@types/umami": "^2.10.1",
+		"facebook-nodejs-business-sdk": "^24.0.1",
+		"http-status-codes": "^2.3.0",
 		"loglevel": "^1.9.2"
 	},
 	"publishConfig": {

pnpm-lock.yaml

@@ -8,9 +8,18 @@ importers:
 
   .:
     dependencies:
+      '@types/facebook-nodejs-business-sdk':
+        specifier: ^23.0.0
+        version: 23.0.0
       '@types/umami':
         specifier: ^2.10.1
         version: 2.10.1
+      facebook-nodejs-business-sdk:
+        specifier: ^24.0.1
+        version: 24.0.1
+      http-status-codes:
+        specifier: ^2.3.0
+        version: 2.3.0
       loglevel:
         specifier: ^1.9.2
         version: 1.9.2
@@ -473,6 +482,9 @@ packages:
   '@types/estree@1.0.8':
     resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}
 
+  '@types/facebook-nodejs-business-sdk@23.0.0':
+    resolution: {integrity: sha512-k9saLiTd4kvBCdBHEpTyDMYlqSsiDw0yHs2ePe5M1PTIldtdtNOGx73Gtu8dQqbTAlwBWbiG3VfI+9s45Cf88w==}
+
   '@types/json-schema@7.0.15':
     resolution: {integrity: sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==}
 
@@ -565,6 +577,12 @@ packages:
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     engines: {node: '>= 0.4'}
 
+  asynckit@0.4.0:
+    resolution: {integrity: sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==}
+
+  axios@1.13.2:
+    resolution: {integrity: sha512-VPk9ebNqPcy5lRGuSlKx752IlDatOjT9paPlm8A7yOuW2Fbvp4X3JznJtT4f0GzGLLiWE9W8onz51SqLYwzGaA==}
+
   axobject-query@4.1.0:
     resolution: {integrity: sha512-qIj0G9wZbMGNLjLmg1PT6v2mE9AH2zlnADJD/2tC6E00hgmhUOfEB6greHPAfLRSufHqROIUTkw6E+M3lH0PTQ==}
     engines: {node: '>= 0.4'}
@@ -578,6 +596,10 @@ packages:
   brace-expansion@2.0.2:
     resolution: {integrity: sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==}
 
+  call-bind-apply-helpers@1.0.2:
+    resolution: {integrity: sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==}
+    engines: {node: '>= 0.4'}
+
   callsites@3.1.0:
     resolution: {integrity: sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==}
     engines: {node: '>=6'}
@@ -605,6 +627,10 @@ packages:
   color-name@1.1.4:
     resolution: {integrity: sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==}
 
+  combined-stream@1.0.8:
+    resolution: {integrity: sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==}
+    engines: {node: '>= 0.8'}
+
   concat-map@0.0.1:
     resolution: {integrity: sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==}
 
@@ -621,6 +647,9 @@ packages:
     engines: {node: '>=4'}
     hasBin: true
 
+  currency-codes@1.5.1:
+    resolution: {integrity: sha512-hqy8vtlIYKzO6pe2TE0V4/riZALIc7nhtE9cvxk5FDRCvfGplgzUvpTmZlMsyO+NeK5U41j+sQXJOo8l8v9kdg==}
+
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     engines: {node: '>=6.0'}
@@ -640,9 +669,37 @@ packages:
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     engines: {node: '>=0.10.0'}
 
+  delayed-stream@1.0.0:
+    resolution: {integrity: sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==}
+    engines: {node: '>=0.4.0'}
+
   devalue@5.6.1:
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+  dunder-proto@1.0.1:
+    resolution: {integrity: sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==}
+    engines: {node: '>= 0.4'}
+
+  email-validator@2.0.4:
+    resolution: {integrity: sha512-gYCwo7kh5S3IDyZPLZf6hSS0MnZT8QmJFqYvbqlDZSbwdZlY6QZWxJ4i/6UhITOJ4XzyI647Bm2MXKCLqnJ4nQ==}
+    engines: {node: '>4.0'}
+
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+    resolution: {integrity: sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==}
+    engines: {node: '>= 0.4'}
+
+  es-errors@1.3.0:
+    resolution: {integrity: sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==}
+    engines: {node: '>= 0.4'}
+
+  es-object-atoms@1.1.1:
+    resolution: {integrity: sha512-FGgH2h8zKNim9ljj7dankFPcICIK9Cp5bm+c2gQSYePhpaG5+esrLODihIorn+Pe6FGJzWhXQotPv73jTaldXA==}
+    engines: {node: '>= 0.4'}
+
+  es-set-tostringtag@2.1.0:
+    resolution: {integrity: sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==}
+    engines: {node: '>= 0.4'}
+
   esbuild@0.27.1:
     resolution: {integrity: sha512-yY35KZckJJuVVPXpvjgxiCuVEJT67F6zDeVTv4rizyPrfGBUpZQsvmxnN+C371c2esD/hNMjj4tpBhuueLN7aA==}
     engines: {node: '>=18'}
@@ -716,6 +773,9 @@ packages:
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     engines: {node: '>=0.10.0'}
 
+  facebook-nodejs-business-sdk@24.0.1:
+    resolution: {integrity: sha512-31uR42FO+V3ikQfVZyrnoc34pVYzxo4PE+BnKt1ziX9nGhSwsS7ogGDsMJQk7A3SdoWPIGgR2G4UbAY2s9zNVQ==}
+
   fast-deep-equal@3.1.3:
     resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
 
@@ -742,6 +802,9 @@ packages:
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     engines: {node: '>=10'}
 
+  first-match@0.0.1:
+    resolution: {integrity: sha512-VvKbnaxrC0polTFDC+teKPTdl2mn6B/KUW+WB3C9RzKDeNwbzfLdnUz3FxC+tnjvus6bI0jWrWicQyVIPdS37A==}
+
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     engines: {node: '>=16'}
@@ -749,11 +812,35 @@ packages:
   flatted@3.3.3:
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+  follow-redirects@1.15.11:
+    resolution: {integrity: sha512-deG2P0JfjrTxl50XGCDyfI97ZGVCxIpfKYmfyrQ54n5FO/0gfIES8C/Psl6kWVDolizcaaxZJnTS0QSMxvnsBQ==}
+    engines: {node: '>=4.0'}
+    peerDependencies:
+      debug: '*'
+    peerDependenciesMeta:
+      debug:
+        optional: true
+
+  form-data@4.0.5:
+    resolution: {integrity: sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==}
+    engines: {node: '>= 6'}
+
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     engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
     os: [darwin]
 
+  function-bind@1.1.2:
+    resolution: {integrity: sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA==}
+
+  get-intrinsic@1.3.0:
+    resolution: {integrity: sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ==}
+    engines: {node: '>= 0.4'}
+
+  get-proto@1.0.1:
+    resolution: {integrity: sha512-sTSfBjoXBp89JvIKIefqw7U2CCebsc74kiY6awiGogKtoSGbgjYE/G/+l9sF3MWFPNc9IcoOC4ODfKHfxFmp0g==}
+    engines: {node: '>= 0.4'}
+
   glob-parent@6.0.2:
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     engines: {node: '>=10.13.0'}
@@ -766,10 +853,29 @@ packages:
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     engines: {node: '>=18'}
 
+  gopd@1.2.0:
+    resolution: {integrity: sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg==}
+    engines: {node: '>= 0.4'}
+
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     engines: {node: '>=8'}
 
+  has-symbols@1.1.0:
+    resolution: {integrity: sha512-1cDNdwJ2Jaohmb3sg4OmKaMBwuC48sYni5HUw2DvsC8LjGTLK9h+eb1X6RyuOHe4hT0ULCW68iomhjUoKUqlPQ==}
+    engines: {node: '>= 0.4'}
+
+  has-tostringtag@1.0.2:
+    resolution: {integrity: sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==}
+    engines: {node: '>= 0.4'}
+
+  hasown@2.0.2:
+    resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
+    engines: {node: '>= 0.4'}
+
+  http-status-codes@2.3.0:
+    resolution: {integrity: sha512-RJ8XvFvpPM/Dmc5SV+dC4y5PCeOhT3x1Hq0NU3rjGeg5a/CqlhZ7uudknPwZFz4aeAXDcbAyaeP7GAo9lvngtA==}
+
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     engines: {node: '>= 4'}
@@ -800,6 +906,12 @@ packages:
   isexe@2.0.0:
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+  iso-3166-1@2.1.1:
+    resolution: {integrity: sha512-RZxXf8cw5Y8LyHZIwIRvKw8sWTIHh2/txBT+ehO0QroesVfnz3JNFFX4i/OC/Yuv2bDIVYrHna5PMvjtpefq5w==}
+
+  js-sha256@0.9.0:
+    resolution: {integrity: sha512-sga3MHh9sgQN2+pJ9VYZ+1LPwXOxuBJBA5nrR5/ofPfuiJBE2hnjsaN8se8JznOmGLN2p49Pe5U/ttafcs/apA==}
+
   js-yaml@4.1.1:
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     hasBin: true
@@ -848,6 +960,18 @@ packages:
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+  math-intrinsics@1.1.0:
+    resolution: {integrity: sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==}
+    engines: {node: '>= 0.4'}
+
+  mime-db@1.52.0:
+    resolution: {integrity: sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==}
+    engines: {node: '>= 0.6'}
+
+  mime-types@2.1.35:
+    resolution: {integrity: sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==}
+    engines: {node: '>= 0.6'}
+
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@@ -855,6 +979,9 @@ packages:
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     engines: {node: '>=16 || 14 >=14.17'}
 
+  mixwith@0.1.1:
+    resolution: {integrity: sha512-DQsf/liljH/9e+94jR+xfK8vlKceeKdOM9H9UEXLwGuvEEpO6debNtJ9yt1ZKzPKPrwqGxzMdu0BR1fnQb6i4A==}
+
   mri@1.2.0:
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     engines: {node: '>=4'}
@@ -874,6 +1001,9 @@ packages:
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+  nub@0.0.0:
+    resolution: {integrity: sha512-dK0Ss9C34R/vV0FfYJXuqDAqHlaW9fvWVufq9MmGF2umCuDbd5GRfRD9fpi/LiM0l4ZXf8IBB+RYmZExqCrf0w==}
+
   optionator@0.9.4:
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     engines: {node: '>= 0.8.0'}
@@ -955,6 +1085,9 @@ packages:
     engines: {node: '>=14'}
     hasBin: true
 
+  proxy-from-env@1.1.0:
+    resolution: {integrity: sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==}
+
   publint@0.3.16:
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     engines: {node: '>=18'}
@@ -1447,6 +1580,8 @@ snapshots:
 
   '@types/estree@1.0.8': {}
 
+  '@types/facebook-nodejs-business-sdk@23.0.0': {}
+
   '@types/json-schema@7.0.15': {}
 
   '@types/node@24.10.4':
@@ -1567,6 +1702,16 @@ snapshots:
 
   aria-query@5.3.2: {}
 
+  asynckit@0.4.0: {}
+
+  axios@1.13.2:
+    dependencies:
+      follow-redirects: 1.15.11
+      form-data: 4.0.5
+      proxy-from-env: 1.1.0
+    transitivePeerDependencies:
+      - debug
+
   axobject-query@4.1.0: {}
 
   balanced-match@1.0.2: {}
@@ -1580,6 +1725,11 @@ snapshots:
     dependencies:
       balanced-match: 1.0.2
 
+  call-bind-apply-helpers@1.0.2:
+    dependencies:
+      es-errors: 1.3.0
+      function-bind: 1.1.2
+
   callsites@3.1.0: {}
 
   chalk@4.1.2:
@@ -1603,6 +1753,10 @@ snapshots:
 
   color-name@1.1.4: {}
 
+  combined-stream@1.0.8:
+    dependencies:
+      delayed-stream: 1.0.0
+
   concat-map@0.0.1: {}
 
   cookie@0.6.0: {}
@@ -1615,6 +1769,11 @@ snapshots:
 
   cssesc@3.0.0: {}
 
+  currency-codes@1.5.1:
+    dependencies:
+      first-match: 0.0.1
+      nub: 0.0.0
+
   debug@4.4.3:
     dependencies:
       ms: 2.1.3
@@ -1625,8 +1784,33 @@ snapshots:
 
   deepmerge@4.3.1: {}
 
+  delayed-stream@1.0.0: {}
+
   devalue@5.6.1: {}
 
+  dunder-proto@1.0.1:
+    dependencies:
+      call-bind-apply-helpers: 1.0.2
+      es-errors: 1.3.0
+      gopd: 1.2.0
+
+  email-validator@2.0.4: {}
+
+  es-define-property@1.0.1: {}
+
+  es-errors@1.3.0: {}
+
+  es-object-atoms@1.1.1:
+    dependencies:
+      es-errors: 1.3.0
+
+  es-set-tostringtag@2.1.0:
+    dependencies:
+      es-errors: 1.3.0
+      get-intrinsic: 1.3.0
+      has-tostringtag: 1.0.2
+      hasown: 2.0.2
+
   esbuild@0.27.1:
     optionalDependencies:
       '@esbuild/aix-ppc64': 0.27.1
@@ -1752,6 +1936,17 @@ snapshots:
 
   esutils@2.0.3: {}
 
+  facebook-nodejs-business-sdk@24.0.1:
+    dependencies:
+      axios: 1.13.2
+      currency-codes: 1.5.1
+      email-validator: 2.0.4
+      iso-3166-1: 2.1.1
+      js-sha256: 0.9.0
+      mixwith: 0.1.1
+    transitivePeerDependencies:
+      - debug
+
   fast-deep-equal@3.1.3: {}
 
   fast-json-stable-stringify@2.1.0: {}
@@ -1771,6 +1966,8 @@ snapshots:
       locate-path: 6.0.0
       path-exists: 4.0.0
 
+  first-match@0.0.1: {}
+
   flat-cache@4.0.1:
     dependencies:
       flatted: 3.3.3
@@ -1778,9 +1975,39 @@ snapshots:
 
   flatted@3.3.3: {}
 
+  follow-redirects@1.15.11: {}
+
+  form-data@4.0.5:
+    dependencies:
+      asynckit: 0.4.0
+      combined-stream: 1.0.8
+      es-set-tostringtag: 2.1.0
+      hasown: 2.0.2
+      mime-types: 2.1.35
+
   fsevents@2.3.3:
     optional: true
 
+  function-bind@1.1.2: {}
+
+  get-intrinsic@1.3.0:
+    dependencies:
+      call-bind-apply-helpers: 1.0.2
+      es-define-property: 1.0.1
+      es-errors: 1.3.0
+      es-object-atoms: 1.1.1
+      function-bind: 1.1.2
+      get-proto: 1.0.1
+      gopd: 1.2.0
+      has-symbols: 1.1.0
+      hasown: 2.0.2
+      math-intrinsics: 1.1.0
+
+  get-proto@1.0.1:
+    dependencies:
+      dunder-proto: 1.0.1
+      es-object-atoms: 1.1.1
+
   glob-parent@6.0.2:
     dependencies:
       is-glob: 4.0.3
@@ -1789,8 +2016,22 @@ snapshots:
 
   globals@16.5.0: {}
 
+  gopd@1.2.0: {}
+
   has-flag@4.0.0: {}
 
+  has-symbols@1.1.0: {}
+
+  has-tostringtag@1.0.2:
+    dependencies:
+      has-symbols: 1.1.0
+
+  hasown@2.0.2:
+    dependencies:
+      function-bind: 1.1.2
+
+  http-status-codes@2.3.0: {}
+
   ignore@5.3.2: {}
 
   ignore@7.0.5: {}
@@ -1814,6 +2055,10 @@ snapshots:
 
   isexe@2.0.0: {}
 
+  iso-3166-1@2.1.1: {}
+
+  js-sha256@0.9.0: {}
+
   js-yaml@4.1.1:
     dependencies:
       argparse: 2.0.1
@@ -1853,6 +2098,14 @@ snapshots:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  math-intrinsics@1.1.0: {}
+
+  mime-db@1.52.0: {}
+
+  mime-types@2.1.35:
+    dependencies:
+      mime-db: 1.52.0
+
   minimatch@3.1.2:
     dependencies:
       brace-expansion: 1.1.12
@@ -1861,6 +2114,8 @@ snapshots:
     dependencies:
       brace-expansion: 2.0.2
 
+  mixwith@0.1.1: {}
+
   mri@1.2.0: {}
 
   mrmime@2.0.1: {}
@@ -1871,6 +2126,8 @@ snapshots:
 
   natural-compare@1.4.0: {}
 
+  nub@0.0.0: {}
+
   optionator@0.9.4:
     dependencies:
       deep-is: 0.1.4
@@ -1937,6 +2194,8 @@ snapshots:
 
   prettier@3.7.4: {}
 
+  proxy-from-env@1.1.0: {}
+
   publint@0.3.16:
     dependencies:
       '@publint/pack': 0.1.2

src/lib/conversion/client.ts

@@ -0,0 +1,91 @@
+import type { TrackingManager } from '$lib/tracking.svelte';
+import type {
+	ConversionErrorResponseBody,
+	ConversionRequestBody,
+	ConversionResponseBody,
+	ConversionUserData
+} from '$lib/types/conversion.js';
+import type { StandardEventName } from '$lib/types/fbq.js';
+
+/**
+ * Client for sending conversion events to a server endpoint.
+ */
+export class ConversionClient {
+	private _href: string;
+	private _trackingManager: TrackingManager;
+
+	/**
+	 * Creates a new ConversionClient.
+	 *
+	 * @param serverHref - The server endpoint URL.
+	 * @param trackingManager - The tracking manager instance.
+	 */
+	constructor(serverHref: string, trackingManager: TrackingManager) {
+		this._href = serverHref;
+		this._trackingManager = trackingManager;
+	}
+
+	/**
+	 * Sends a conversion event to the server.
+	 *
+	 * @param eventName - The name of the standard event to send.
+	 * @param options - Additional options for the event.
+	 * @returns A promise that resolves to the event response or error.
+	 */
+	async trackEvent(
+		eventName: StandardEventName,
+		options: {
+			eventID: string;
+			user?: Omit<ConversionUserData, 'ip' | 'fbp' | 'fbc' | 'ua'>;
+			customData?: Record<string, string>;
+		}
+	): Promise<ConversionResponseBody | ConversionErrorResponseBody> {
+		// Extract user data
+		const fbp = await cookieStore.get('_fbp');
+		const fbc = await cookieStore.get('_fbc');
+
+		const user: ConversionUserData = {
+			...options.user,
+			fbp: fbp?.value,
+			fbc: fbc?.value
+		};
+
+		// Get event source URL & extract UTM params if present
+		const eventSourceURL = window.location.href;
+		const url = new URL(eventSourceURL);
+		const utms: Record<string, string> = {};
+		url.searchParams.forEach((value, key) => {
+			if (key.startsWith('utm_')) {
+				utms[key] = value;
+			}
+		});
+
+		// Build request body
+		const requestBody: ConversionRequestBody = {
+			consent: this._trackingManager.consent === true,
+			eventName,
+			eventID: options.eventID,
+			user,
+			eventSourceURL,
+			utms,
+			customData: options.customData
+		};
+
+		// Send request to server
+		const response = await fetch(this._href, {
+			method: 'POST',
+			headers: {
+				'Content-Type': 'application/json'
+			},
+			body: JSON.stringify(requestBody)
+		});
+
+		if (response.ok) {
+			const data = (await response.json()) as ConversionResponseBody;
+			return data;
+		} else {
+			const errorData = (await response.json()) as ConversionErrorResponseBody;
+			return errorData;
+		}
+	}
+}

src/lib/conversion/control.ts

@@ -0,0 +1,117 @@
+import {
+	CustomData,
+	EventRequest,
+	EventResponse,
+	ServerEvent,
+	UserData
+} from 'facebook-nodejs-business-sdk';
+import type { StandardEventName } from '../types/fbq.js';
+import type { ConversionUserData } from '$lib/types/conversion.js';
+
+/**
+ * Builds UserData for conversion events.
+ *
+ * @param data - The user data to include.
+ * @returns The constructed UserData object.
+ */
+export const buildConversionUserData = (data: ConversionUserData): UserData => {
+	const userData = new UserData();
+	if (data.email) userData.setEmail(data.email);
+	if (data.phone) userData.setPhone(data.phone);
+	if (data.firstName) userData.setFirstName(data.firstName);
+	if (data.lastName) userData.setLastName(data.lastName);
+	if (data.ip) userData.setClientIpAddress(data.ip);
+	if (data.fbp) userData.setFbp(data.fbp);
+	if (data.fbc) userData.setFbc(data.fbc);
+	if (data.ua) userData.setClientUserAgent(data.ua);
+	if (data.externalId) userData.setExternalId(data.externalId);
+	return userData;
+};
+
+/**
+ * Builds CustomData for conversion events.
+ *
+ * @param params - The custom data parameters.
+ * @returns The constructed CustomData object.
+ */
+export const buildCustomData = (params: Record<string, string>): CustomData => {
+	const c = new CustomData();
+	// Map known fields safely
+	if (params.currency) c.setCurrency(params.currency);
+	if (typeof params.value === 'number') c.setValue(params.value);
+	if (Array.isArray(params.contents)) c.setContents(params.contents);
+	if (params.content_type) c.setContentType(params.content_type);
+	if (Array.isArray(params.content_ids)) c.setContentIds(params.content_ids);
+	if (typeof params.num_items === 'number') c.setNumItems(params.num_items);
+	if (params.search_string) c.setSearchString(params.search_string);
+	// Attach anything else as custom_properties
+	const extras = { ...params };
+	delete extras.currency;
+	delete extras.value;
+	delete extras.contents;
+	delete extras.content_type;
+	delete extras.content_ids;
+	delete extras.num_items;
+	delete extras.search_string;
+	if (Object.keys(extras).length) c.setCustomProperties(extras);
+	return c;
+};
+
+/**
+ * Parameters for sending a conversion event to Meta Pixel.
+ */
+export type ConversionEventOptions = {
+	eventID: string;
+	eventSourceURL?: string;
+	actionSource: 'website' | 'app' | 'offline' | 'other';
+	userData: UserData;
+	customData?: CustomData;
+};
+
+/**
+ * Control class for sending Conversion API events to Meta Pixel.
+ */
+export class ConversionControl {
+	private _accessToken: string;
+	private _pixelID: string;
+	private _testEventCode?: string;
+
+	/**
+	 * Creates a new ConversionControl instance.
+	 *
+	 * @param accessToken - Your Meta Pixel Conversion API access token.
+	 * @param pixelID - Your Meta Pixel ID.
+	 * @param testEventCode - Optional test event code for testing events.
+	 */
+	constructor(accessToken: string, pixelID: string, testEventCode?: string) {
+		this._accessToken = accessToken;
+		this._pixelID = pixelID;
+		this._testEventCode = testEventCode;
+	}
+
+	/**
+	 * Sends a conversion event to Meta Pixel.
+	 *
+	 * @param eventName - The name of the standard event to send.
+	 * @param options - Additional options for the event.
+	 * @returns A promise that resolves to the event response.
+	 */
+	async trackEvent(
+		eventName: StandardEventName,
+		options: ConversionEventOptions
+	): Promise<EventResponse> {
+		const event = new ServerEvent()
+			.setEventName(eventName)
+			.setEventTime(Math.floor(Date.now() / 1000))
+			.setEventId(options.eventID)
+			.setUserData(options.userData)
+			.setActionSource(options.actionSource);
+
+		if (options?.eventSourceURL) event.setEventSourceUrl(options.eventSourceURL);
+		if (options?.customData) event.setCustomData(options.customData);
+
+		const req = new EventRequest(this._accessToken, this._pixelID).setEvents([event]);
+		if (this._testEventCode) req.setTestEventCode(this._testEventCode);
+		return req.execute();
+	}
+}

src/lib/conversion/index.ts

@@ -0,0 +1,3 @@
+export * from './client.ts';
+export * from './server.ts';
+export * from './control.ts';

src/lib/conversion/server.ts

@@ -0,0 +1,67 @@
+import { json, type RequestHandler } from '@sveltejs/kit';
+import { buildConversionUserData, buildCustomData, ConversionControl } from './control.ts';
+import type {
+	ConversionErrorResponseBody,
+	ConversionRequestBody,
+	ConversionResponseBody
+} from '$lib/types/conversion.js';
+
+import { StatusCodes } from 'http-status-codes';
+
+export const createConversionRequestHandler: (control: ConversionControl) => RequestHandler = (
+	control
+) => {
+	const handle: RequestHandler = async ({ request, getClientAddress }) => {
+		try {
+			const body = (await request.json()) as ConversionRequestBody;
+
+			// Build user data with IP and user agent
+			const ip = getClientAddress();
+			const ua = request.headers.get('user-agent');
+
+			const userData = buildConversionUserData({
+				...body.user,
+				ip,
+				ua: ua ?? body.user?.ua ?? undefined
+			});
+
+			// Build custom data with UTM params if applicable
+			let rawCustomData = body.customData ?? {};
+			if (body.eventName === 'PageView' && body.utms) {
+				// For PageView events, automatically include UTM params if provided
+				rawCustomData = {
+					...rawCustomData,
+					...body.utms
+				};
+			}
+
+			const customData = buildCustomData(rawCustomData);
+
+			// Send the event via the control
+			const response = await control.trackEvent(body.eventName, {
+				eventID: body.eventID,
+				eventSourceURL: body.eventSourceURL,
+				actionSource: 'website',
+				userData,
+				customData
+			});
+
+			// Structure the response
+			const structuredResponse: ConversionResponseBody = {
+				pixelID: response.id,
+				fbtrace_id: response.fbtrace_id,
+				receivedEvents: response.events_received,
+				processedEvents: response.num_processed_entries,
+				messages: response.messages
+			};
+
+			return json(structuredResponse, { status: StatusCodes.OK });
+		} catch (e) {
+			return json(
+				{ error: e instanceof Error ? e.message : String(e) } as ConversionErrorResponseBody,
+				{ status: StatusCodes.INTERNAL_SERVER_ERROR }
+			);
+		}
+	};
+	return handle;
+};

src/lib/types/conversion.d.ts

@@ -0,0 +1,53 @@
+import type { StandardEventName } from '../types/fbq.js';
+
+/**
+ * Supported user data fields for conversion events.
+ */
+export type ConversionUserData = {
+	email?: string;
+	phone?: string;
+	firstName?: string;
+	lastName?: string;
+	ip?: string;
+	fbp?: string;
+	fbc?: string;
+	/** user agent */
+	ua?: string;
+	externalId?: string;
+};
+
+/**
+ * Request body for conversion event tracking.
+ */
+export type ConversionRequestBody = {
+	consent: boolean;
+	eventName: StandardEventName;
+	eventID: string;
+	eventSourceURL?: string;
+	utms?: Partial<
+		Record<'utm_source' | 'utm_medium' | 'utm_campaign' | 'utm_content' | 'utm_term', string>
+	>;
+	user?: Omit<ConversionUserData, 'ip'>;
+	customData?: Record<string, string>;
+};
+
+/**
+ * Response body for conversion event tracking.
+ */
+export type ConversionResponseBody = {
+	/** Dataset or Pixel ID to which the event successfully posted. */
+	pixelID: string;
+	/** fbtrace_id for debugging purposes. */
+	fbtrace_id: string;
+	/** Number of events received that were sent by the request. */
+	receivedEvents: number;
+	/** Number of events successfully posted by the request. */
+	processedEvents: number;
+	/** Messages returned by the server. */
+	messages: string[];
+};
+
+/** Error response body for conversion event tracking. */
+export type ConversionErrorResponseBody = {
+	error: string;
+};